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Physical Geography

261 questions

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Question 41Question →

When swash carries beach material up a shoreline at an oblique angle and backwash drags it perpendicular to the coast, sediment migrates laterally via longshore drift. If this ongoing deposition extends an embankment entirely across the entrance of an indentation, connecting two headlands and impounding a coastal lagoon behind it, which geomorphic feature is formed?

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Answer: A baymouth bar

Answer

A baymouth bar
Longshore drift moves sediment along the shoreline when waves break obliquely. When sand and shingle build out across an indentation or bay until reaching the opposite headland, the feature completely encloses the bay to form a baymouth bar, isolating a lagoon behind it.

Step-by-Step Solution

1
Analyze the marine sediment transport mechanism described in the stem
Identify that oblique swash and direct backwash produce longshore drift along the coast
Prevailing wind direction governs swash angle while gravity dictates backwash return
2
Determine the morphological outcome of longshore drift across a bay
Sediment builds a spit that progressively extends across the bay mouth to the opposing headland
Uninterrupted deposition joins both sides and traps water behind the sand ridge
3
Match the complete closure feature to coastal landform terminology
A continuous ridge sealing off a bay and forming a lagoon is classified as a baymouth bar
Distinguishes a fully closed bar from an open-ended spit or offshore bar

Key Concept

Longshore drift and coastal depositional landforms (Baymouth bar formation)
Estimated Time:1m 30s
Question 42Question →

A civil engineering firm in Nigeria requires a coarse-grained, highly durable rock with high compressive strength for constructing heavy building foundations and road monuments. Which rock type best fulfills this requirement, and what is its primary mode of origin?

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Answer: Granite, formed through the slow cooling and crystallization of magma deep beneath the Earth's surface

Answer

Granite, formed through the slow cooling and crystallization of magma deep beneath the Earth's surface
Granite is an intrusive (plutonic) igneous rock. Because magma cools slowly beneath the Earth's crust, large mineral crystals form, giving it a coarse-grained texture and immense structural strength. This makes it an ideal material for foundation construction, aggregate production, and monuments.

Step-by-Step Solution

1
Identify the required rock characteristics described in the engineering scenario
The target rock must be coarse-grained (phaneritic), exceptionally durable, and resistant to high pressure.
Engineering applications such as heavy foundations demand plutonic igneous rocks with interlocking mineral crystals.
2
Evaluate the geological origin of candidate rock types
Granite forms as intrusive magma cools slowly deep underground, allowing large crystals of quartz and feldspar to grow, imparting high strength and coarse texture.
Slow cooling underground produces plutonic igneous rocks, whereas rapid surface cooling produces fine-grained volcanic rocks like basalt.

Key Concept

Classification and Economic Importance of Igneous Rocks
Question 43Question →

A geological survey of a sedimentary basin identifies a fine-grained, impermeable rock formed from the compaction of mud and clay particles, which frequently acts as an effective cap rock for trapping petroleum. Which rock type exhibits these specific origin and structural characteristics?

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Answer: Shale

Answer

Shale is the fine-grained sedimentary rock formed from compressed mud and clay that serves as an impermeable cap rock in petroleum reservoirs.
Shale is a mechanically formed, fine-grained argillaceous sedimentary rock produced through the diagenesis and compaction of mud, clay, and silt particles. Because of its microscopic pore spaces and low permeability, shale acts as an impermeable seal or cap rock that prevents crude oil and natural gas from escaping upward out of porous reservoir rocks.

Step-by-Step Solution

1
Analyze the rock characteristics given in the stem: fine-grained texture, origin from mud/clay compaction, and low permeability serving as petroleum cap rock.
Identified that the target rock belongs to the argillaceous group of mechanically formed sedimentary rocks.
Sedimentary rocks derived from clay and silt deposits compact into fissile, fine-grained argillaceous rocks.
2
Match these physical properties and economic importances to the correct rock classification.
Shale fits all criteria (argillaceous sedimentary origin, fine-grained mud/clay composition, impermeable structure trapping hydrocarbons).
Metamorphic rocks (marble, quartzite) and igneous rocks (granite) have different origins and structural properties.

Key Concept

Sedimentary rock classification by origin, texture, and economic significance in hydrocarbon trapping
Estimated Time:1m 0s
Question 44Question →

Geophysical measurements reveal critical physical transitions within Earth's internal structure as well as distinct operational mechanisms across its external spheres. Which of the following options correctly pairs a boundary transition within Earth's interior with an accurate description of a surface process reshaping the external lithosphere?

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Answer: The Gutenberg discontinuity marks the boundary between the solid lower mantle and liquid outer core where S-waves cease to propagate, while weathering acts as an in-situ breakdown of surface rocks without direct gravitational transportation.

Answer

The Gutenberg discontinuity marks the boundary between the solid lower mantle and liquid outer core where S-waves cease to propagate, while weathering acts as an in-situ breakdown of surface rocks without direct gravitational transportation.
The Gutenberg discontinuity lies at the boundary between the lower mantle and the outer core (at a depth of around 2900 km2900\text{ km}). Because the outer core is liquid, transverse SS-waves cannot pass through it. Externally, weathering is the static, in-situ breakdown of rock materials on Earth's surface, distinct from downslope mass movement.

Step-by-Step Solution

1
Analyze internal boundary physical properties
The Gutenberg discontinuity occurs at a depth of approximately 2900 km2900\text{ km}, marking the transition from the solid silicate mantle to the liquid iron-nickel outer core. Because secondary (SS) seismic waves cannot travel through liquids, they terminate at this boundary.
Establishing the correct geophysical behavior of seismic waves at Earth's internal boundaries is necessary to evaluate the internal structure component.
2
Evaluate external lithospheric surface processes
Weathering is defined strictly as the static, in-situ physical disintegration and chemical decomposition of rocks exposed at Earth's surface.
Distinguishing weathering from mass movement processes is essential to correctly characterize external sphere dynamics.
3
Synthesize and select the correct pairing
The statement combining the Gutenberg discontinuity SS-wave shear cutoff with in-situ weathering accurately represents both internal and external structural processes.
Matching both validated components identifies the unique correct choice.

Key Concept

Internal Discontinuities and External Lithospheric Processes
Estimated Time:2m 0s
Question 45Question →

In an arid, high-altitude alpine environment experiencing diurnal freeze-thaw cycles and torrential seasonal rainfall, angular rock fragments disintegrate from steep granite cliffs and accumulate at the base. Subsequent heavy rainfall saturates these loose debris accumulations, causing them to flow rapidly down a narrow drainage channel. Which combination of physical weathering and mass wasting processes accurately accounts for this sequence of landscape evolution?

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Answer: Frost shattering followed by mudflow

Answer

The initial mechanical disintegration of granite cliffs is caused by frost shattering (frost wedging), and the subsequent rapid downslope movement of saturated debris along a channel is a mudflow.
The correct response correctly identifies frost shattering as the mechanical weathering process driven by freeze-thaw cycles in high-altitude environments, and mudflow as the rapid movement of water-saturated debris down a defined channel.

Step-by-Step Solution

1
Analyze the primary weathering process described in the scenario.
In high-altitude areas with diurnal freeze-thaw temperature fluctuations around 0∘C0^\circ\text{C}, water trapped in rock joints expands by approximately 9%9\% upon freezing. This exerts internal stress, leading to frost shattering (gelifraction) that detaches angular fragments (scree/talus).
Identifying the specific mechanical weathering process operating under alpine freeze-thaw conditions.
2
Analyze the mass wasting mechanism operating on the accumulated debris.
When sudden torrential rainfall saturates the loose scree fragments, the material behaves as a high-density liquid and surges rapidly down confined channels as a mudflow (or debris flow).
Distinguishing rapid, channelized, water-saturated mass movement from slow or non-fluid slope movements.

Key Concept

Interaction of Frost Wedging and Rapid Channelized Mass Wasting
Estimated Time:2m 0s
Question 46Question →

Which of the following landforms is formed primarily by river deposition in its lower course?

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Answer: Delta

Answer

Delta
A delta is formed in the lower course of a river where the gradient flattens and water flow slows down drastically upon reaching a sea or lake. This reduction in velocity causes the stream to deposit its load of sand, silt, and clay at the mouth.

Step-by-Step Solution

1
Identify the stage of the river and process specified in the prompt
The question asks for a feature formed by river deposition in its lower course.
River courses are divided into upper (erosional), middle (transportational/depositional), and lower (predominantly depositional) stages.
2
Evaluate the landform options against the course and process
Deltas are built when a river enters a lake or sea in its lower course, reducing velocity and depositing its sediment load.
Other options represent upper-course erosional features, mass wasting, or metamorphic rock features.

Key Concept

Fluvial Deposition and River Stage Features
Estimated Time:45s
Question 47Question →

Arrange the following stages of river capture (stream piracy) in their correct chronological sequence from the initial headward erosion to the final landform development.

Drag items to arrange them in the correct order

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Answer

The correct sequence begins with headward erosion toward the watershed divide, followed by breaching the divide to intercept the weaker stream, the diversion of flow creating an elbow of capture, and finally the formation of a wind gap and misfit stream downstream.
River capture begins when a stream with higher energy or a steeper gradient erodes headward into a watershed divide. Once the divide is breached, the stream intercepts the headwaters of a neighbouring channel. The diverted water creates a sharp bend known as an elbow of capture, while the dry valley below the point of capture becomes a wind gap containing a reduced misfit stream.

Step-by-Step Solution

1
Identify the initial process causing river capture
Headward erosion by the pirate stream with greater erosive power cuts back into the watershed divide.
Unequal gradient or rock resistance causes one stream to extend its valley headward faster than adjacent streams.
2
Determine the moment of interception
The pirate stream cuts through the divide and breaches the upper channel of the adjacent stream.
The divide is eliminated at the lowest col, enabling physical connection between the two drainage systems.
3
Analyze the immediate hydrological redirection
Water from the captured stream flows into the capturing river, forming a sharp right-angled turn called the elbow of capture.
The higher gradient of the pirate stream draws water into its steeper channel.
4
Establish the resulting morphological landforms downstream
The abandoned lower channel retains a wind gap and a misfit stream.
The loss of headwater discharge leaves the former channel oversized relative to its remaining reduced discharge.

Key Concept

River Capture (Stream Piracy) and Drainage Evolution
Question 48Question →

Match each rock type in Column I with its correct parent rock or mode of formation in Column II.

Click a left item, then click its matching right item

Items

Marble
Slate
Quartzite
Coal

Matches

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Answer

Marble corresponds to the metamorphism of limestone; Slate corresponds to the metamorphism of clay or shale; Quartzite corresponds to the recrystallization of quartz sandstone; Coal corresponds to the compaction of organic plant remains.
Each rock is matched strictly according to its geological formation process: Marble is metamorphosed limestone, Slate is metamorphosed clay or shale, Quartzite is metamorphosed sandstone, and Coal is formed organically from buried plant matter.

Step-by-Step Solution

1
Determine the origin of Marble
Marble is formed when limestone undergoes metamorphic transformation.
Calcium carbonate grains in limestone recrystallize under heat and pressure into interlocking calcite crystals.
2
Determine the origin of Slate
Slate is derived from shale or clay under low-grade metamorphic conditions.
Directional pressure aligns microscopic clay minerals perpendicular to stress, creating characteristic slaty cleavage.
3
Determine the origin of Quartzite
Quartzite forms from quartz sandstone during metamorphism.
Extreme pressure and heat fuse individual silica sand grains into a continuous crystalline matrix.
4
Determine the origin of Coal
Coal originates from accumulated organic vegetable matter.
Anaerobic decay and continuous burial convert plant debris into peat, lignite, and bituminous coal.

Key Concept

Metamorphic parent rocks (protoliths) and organic sedimentary rock formation
Question 49Question →

Match each physical geography feature below with its corresponding process and landform type.

Click a left item, then click its matching right item

Items

Yardang
Barchan
Cirque
Moraine

Matches

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Answer

Yardang matches Aeolian erosional landform produced by wind abrasion; Barchan matches Aeolian depositional crescent-shaped sand dune; Cirque matches Glacial erosional armchair-shaped hollow; Moraine matches Glacial depositional ridge composed of unsorted till.
Each feature is correctly matched to its active agent (wind or moving ice) and whether the process involved is erosional or depositional.

Step-by-Step Solution

1
Identify the primary erosional wind landform
Yardang corresponds to wind abrasion acting on alternating rock strata.
Yardangs are distinct wind-eroded ridges found in arid environments.
2
Identify the primary depositional wind landform
Barchan corresponds to crescent-shaped sand deposition.
Barchans develop under wind action where sand supplies are moderate and winds blow from a single direction.
3
Identify the primary erosional glacial landform
Cirque corresponds to the steep-walled, armchair-shaped mountain hollow.
Cirques are created at the source of mountain glaciers by freeze-thaw weathering and ice plucking.
4
Identify the primary depositional glacial landform
Moraine corresponds to ridges composed of unsorted glacial till.
Moraines are formed when glaciers deposit rock debris as they melt or retreat.

Key Concept

Classification of landforms by geomorphic agent (wind vs glacier) and process (erosion vs deposition)
Question 50Question →

Geological mapping along an active fold mountain belt reveals a progression of rocks exhibiting distinct foliated textures, ranging from fine-grained slate to coarse-grained gneiss. Which of the following statements correctly explains the process responsible for this texture progression and the resulting economic application of gneiss?

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Answer: High-grade regional metamorphism driven by intense heat and directed pressure causes progressive mineral recrystallization and foliation, making gneiss valuable as a durable construction aggregate.

Answer

High-grade regional metamorphism driven by intense heat and directed pressure causes progressive mineral recrystallization and foliation, making gneiss valuable as a durable construction aggregate.
Regional metamorphism over vast mountain-building zones Subjects parent rocks to intense differential stress and high heat, driving progressive recrystallization from fine slate to coarse, banded gneiss. Gneiss has high compressive strength and durability, making it an excellent material for heavy construction foundations and aggregate.

Step-by-Step Solution

1
Analyze the rock texture progression described in the stem.
The sequence from fine-grained slate to coarse-grained gneiss represents increasing grade of regional metamorphism.
Large-scale tectonic pressure and geothermal heat during mountain building alter minerals dynamically, forming foliated textures.
2
Evaluate the metamorphic process and structural characteristics of gneiss.
Gneiss exhibits distinct mineral banding (alternating light and dark minerals) due to high-grade recrystallization under directed stress.
This sets regional metamorphism apart from contact metamorphism or sedimentary deposition.
3
Determine the economic utility of gneiss based on its physical properties.
Due to its high compressive strength, density, and resistance to weathering, gneiss is extensively quarried for building stone, road metal, and coarse aggregates.
Economic applications directly depend on physical durability derived from metamorphic crystallization.

Key Concept

Regional Metamorphism and Economic Importance of Metamorphic Rocks
Estimated Time:1m 30s
Question 51Question →

Coastal landforms evolve through continuous wave processes such as hydraulic action and abrasion along headlands. Which of the following features is formed primarily by coastal marine erosion?

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Answer: A sea stack

Answer

A sea stack is formed primarily by coastal marine erosion.
A sea stack is formed by continuous hydraulic action and abrasion on a rocky headland. Wave action undermines caves on both sides of a headland to form an arch, which eventually collapses under gravity, leaving behind a freestanding pillar of rock.

Step-by-Step Solution

1
Identify the process responsible for forming each landform option.
Marine erosion operates along coastlines, while rivers create fluvial landforms, gravity creates slope landforms, and heat/pressure form rocks.
Categorizing features by their main geomorphic agent isolates the correct coastal process.
2
Evaluate the coastal erosional sequence.
Waves attack headland weakness →\rightarrow sea cave →\rightarrow sea arch →\rightarrow arch collapse leaves an isolated pillar called a sea stack.
Sea stacks represent a direct stage in coastal headland erosion.

Key Concept

Coastal Erosional Landforms
Estimated Time:45s
Question 52Question →

A rocky headland exposed to persistent marine wave action undergoes sequential destructive geomorphic processes over time. Arrange the following coastal features in the correct chronological order of their evolution, starting from the earliest stage of headland erosion to the final remnant landform.

Drag items to arrange them in the correct order

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Answer

The correct sequence of coastal landform evolution is: (1) Hydraulic action and wave abrasion enlarge sea-level joints into a wave-cut notch and cave, (2) Continuous wave erosion pierces completely through the headland, forming a sea arch, (3) Subaerial weathering and gravity cause the unsupported roof of the arch to collapse, (4) An isolated, vertical column of resistant rock remains standing as a sea stack, and (5) Basal wave undercutting weakens the vertical pillar, causing it to collapse into a sea stump.
Coastal headland degradation follows a strict geomorphic sequence driven by wave action and weathering. Initially, marine processes (hydraulic action and abrasion) enlarge lines of weakness into a cave. As erosion cuts through the headland, an open arch is created. Subaerial weathering then weakens the arch roof until it collapses under gravity, leaving an isolated pillar called a stack. Persistent wave undercutting at the base eventually causes the stack to fall, leaving behind a low-lying stump.

Step-by-Step Solution

1
Identify the initial marine erosional process acting on a pristine cliff face.
Formation of a wave-cut notch and sea cave.
High-energy waves exploit geological joints and lines of weakness near the waterline.
2
Determine the structural change as wave penetration deepens through the headland.
Formation of a sea arch.
Erosion completely perforates the headland, connecting opposite sides under a rock bridge.
3
Identify the subaerial process destabilizing the overarching rock mass.
Collapse of the sea arch roof.
Freeze-thaw, salt weathering, and gravity weaken the unsupported arch roof until it falls.
4
Identify the coastal landform isolated from the mainland cliff after roof collapse.
Formation of a sea stack.
The isolated seaward column remains standing as a free pillar.
5
Determine the final remnant feature resulting from continued wave attack at the base of the pillar.
Reduction to a sea stump.
Under-cutting of the stack base causes top-heavy collapse, leaving only a low-lying rock stump.

Key Concept

Sequential Headland Erosion and Coastal Geomorphology
Question 53Question →

Coal is an economically vital rock widely utilized as a fuel source for power generation and industrial processes. Through which of the following processes is coal formed?

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Answer: Accumulation, decay, and compaction of organic plant remains in marshy environments

Answer

The accumulation, decay, and compaction of organic plant remains in marshy environments over geological time.
Coal is an organically formed sedimentary rock derived from accumulated plant debris in swampy conditions. Over millions of years, heat and overburden pressure compress the organic layers, turning them into carbon-rich coal deposits.

Step-by-Step Solution

1
Identify the rock classification of coal.
Coal is categorized as an organically formed sedimentary rock.
Sedimentary rocks can be mechanically, chemically, or organically formed depending on the origin of the constituent materials.
2
Analyze the formation mechanism for organically formed sedimentary rocks.
Dense vegetation in swampy or marshy environments dies, accumulates in oxygen-poor conditions to prevent full decay, and undergoes compaction under overlying sediments.
Heat and pressure over millions of years convert peat into lignite, bituminous coal, and anthracite.
3
Select the option matching this organic sedimentary origin.
The correct response describes the decay, accumulation, and compaction of vegetative plant matter.
Igneous and metamorphic processes do not yield coal.

Key Concept

Organically Formed Sedimentary Rocks
Question 54Question →

A river system flowing across a mature landscape experiences sudden tectonic uplift, causing a significant base-level drop. This change reactivates intense vertical erosion, prompting the river to cut deeply into its former floodplain and leave step-like benches at identical elevations on both sides of the new valley. Which landform is produced by this geomorphic process?

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Answer: Paired river terraces

Answer

Paired river terraces are formed when river rejuvenation leads to vertical downcutting into a former floodplain, creating symmetrical bench-like landforms on opposite sides of the valley.
Paired river terraces represent former floodplain levels left standing above the current channel after river rejuvenation. Tectonic uplift or a drop in sea level increases the river's gradient and kinetic energy, driving rapid vertical downcutting. As the river carves a deeper inner gorge, remnants of the old valley floor remain as flat bench-like steps at identical elevations on both sides of the valley.

Step-by-Step Solution

1
Analyze the geomorphic trigger described in the stem.
Tectonic uplift drops the base level, initiating river rejuvenation and accelerating vertical downcutting.
Rejuvenation increases the river's energy, allowing it to incise deeply into its existing channel floor.
2
Examine the spatial arrangement of the resulting valley features.
The old floodplain is abandoned above the active channel, forming flat, bench-like steps at matching elevations across the valley.
When downcutting occurs evenly across symmetrical valley sides, paired terraces are formed.
3
Match the observed features to the correct geomorphic landform.
The step-like remnants at equal heights are identified as paired river terraces.
Unpaired terraces occur with lateral meander migration, whereas equal-height benches on both sides confirm paired terraces.

Key Concept

River Rejuvenation and Terrace Formation
Estimated Time:2m 0s
Question 55Question →

A weather station in Ibadan recorded a daily maximum temperature of 34∘C34^\circ\text{C} and a daily minimum temperature of 22∘C22^\circ\text{C}. What is the diurnal range of temperature for that day in ∘C{}^\circ\text{C}?

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Answer: 12

Answer

12 °C
The diurnal temperature range is found by subtracting the minimum daily temperature from the maximum daily temperature: 34∘C−22∘C=12∘C34^\circ\text{C} - 22^\circ\text{C} = 12^\circ\text{C}.

Step-by-Step Solution

1
Identify the recorded daily maximum and minimum temperatures
Maximum temperature = 34∘C34^\circ\text{C}, Minimum temperature = 22∘C22^\circ\text{C}
Diurnal range calculation requires the extreme temperature values recorded within a 24-hour period.
2
Calculate the difference between the maximum and minimum temperatures
34∘C−22∘C=12∘C34^\circ\text{C} - 22^\circ\text{C} = 12^\circ\text{C}
The diurnal (daily) range of temperature is defined as the arithmetic difference between the highest and lowest temperatures of the day.

Key Concept

Diurnal Temperature Range
Estimated Time:45s
Question 56Question →

An airplane departs from Town X, located at longitude 45∘E45^\circ\text{E}, at 08:30 local time on Tuesday, bound for Town Y, located at longitude 75∘W75^\circ\text{W}. If the total flight duration is 10 hours, what is the local time and day of arrival at Town Y?

Show answer & explanation

Answer: 10:30 AM on Tuesday

Answer

10:30 AM on Tuesday
The correct arrival time is 10:30 AM on Tuesday. Because Town X (45∘E45^\circ\text{E}) and Town Y (75∘W75^\circ\text{W}) are in different hemispheres, their longitudinal distance is 45∘+75∘=120∘45^\circ + 75^\circ = 120^\circ. Dividing by 15∘15^\circ per hour gives an 8-hour time difference. Since Town Y lies west of Town X, time is subtracted, making the local time at Town Y at the moment of departure 00:30 (12:30 AM) on Tuesday. Adding the 10-hour flight time results in arrival at 10:30 AM on Tuesday.

Step-by-Step Solution

1
Calculate total longitudinal difference between Town X (45∘E45^\circ\text{E}) and Town Y (75∘W75^\circ\text{W}).
45∘+75∘=120∘45^\circ + 75^\circ = 120^\circ longitudinal difference.
Locations in opposite hemispheres (East and West) require adding longitudes to find total angular separation.
2
Convert longitudinal difference into time difference using 15∘=1 hour15^\circ = 1\text{ hour}.
120∘15∘=8 hours\frac{120^\circ}{15^\circ} = 8\text{ hours} time difference.
Earth rotates 360∘360^\circ in 24 hours, which equals 15∘15^\circ per hour.
3
Determine local departure time at Town Y.
08:30−8 hours=00:30 (12:30 AM) on Tuesday08:30 - 8\text{ hours} = 00:30\text{ (12:30 AM) on Tuesday}.
Town Y is west of Town X, so local time is behind (subtract time when moving west).
4
Add the flight duration to the local departure time at Town Y.
00:30+10 hours=10:30 AM on Tuesday00:30 + 10\text{ hours} = 10:30\text{ AM on Tuesday}.
Elapsed flight time moves local arrival time forward by 10 hours.

Key Concept

Longitude and local time adjustment across meridians and flight duration
Estimated Time:2m 0s
Question 57Question →

Match each landform feature with its corresponding process of formation and distinct structural characteristic.

Click a left item, then click its matching right item

Items

Yardang
Roche Moutonnée
Barchan
Drumlin

Matches

Show answer & explanation

Answer

Yardang matches with aeolian wind abrasion producing parallel ridges; Roche Moutonnée matches with glacial erosion combining stoss-side abrasion and lee-side plucking; Barchan matches with aeolian deposition forming a crescent dune with downwind horns; Drumlin matches with glacial deposition molding subglacial till into an oval hill.
Each feature is correctly linked to its primary geomorphic agent (wind or ice), process (erosion or deposition), and distinct structural geometry.

Step-by-Step Solution

1
Classify each landform by agent of erosion or deposition.
Yardang and Barchan are aeolian (wind-formed) features; Roche Moutonnée and Drumlin are glacial (ice-formed) features.
Categorizing by geomorphic agent reduces potential matching combinations.
2
Differentiate between erosional and depositional mechanics for the aeolian pair.
Yardangs are formed by wind abrasion carving rock, while Barchans are depositional sand dunes.
Process mechanics distinguish landforms shaped by wind action.
3
Differentiate between erosional and depositional mechanics for the glacial pair.
Roche Moutonnée is an asymmetrical bedrock outcrop shaped by plucking and abrasion, whereas a drumlin is an elongated hill formed by deposited glacial till.
Morphological orientation relative to ice flow distinguishes glacial landform types.

Key Concept

Classification of landforms by process (abrasion, plucking, deposition) and agent (wind vs. glacier)
Question 58Question →

Rocks are classified based on their origin, physical characteristics, and economic utility. Which option correctly matches each rock type with its formation process and primary application?

Click a left item, then click its matching right item

Items

Basalt
Chalk
Gneiss
Rock Salt

Matches

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Answer

Basalt matches fine-grained extrusive igneous rock used in road aggregate; Chalk matches soft calcareous organic sedimentary rock used for agricultural lime; Gneiss matches high-grade foliated metamorphic rock with distinct mineral bands; Rock Salt matches evaporite chemical sedimentary rock used in chemical industries.
Each rock is matched correctly to its fundamental genetic class: Basalt is an extrusive igneous rock used as road aggregate, Chalk is an organic sedimentary rock used for agricultural lime, Gneiss is a foliated metamorphic rock displaying banded minerals, and Rock Salt is a chemical evaporite sedimentary rock used in industry.

Step-by-Step Solution

1
Identify the origin and characteristics of Basalt.
Basalt is formed from rapid surface cooling of basic molten lava (extrusive igneous) and is economically valuable as road aggregate.
Extrusive volcanic rocks cool quickly, creating fine-grained crystalline textures suited for heavy construction.
2
Identify the origin and characteristics of Chalk.
Chalk forms from compressed calcium carbonate micro-organisms in shallow seas (organic sedimentary) and serves in lime/cement making.
Organically derived rocks consist of accumulated biological remains.
3
Identify the origin and characteristics of Gneiss.
Gneiss forms from intense heat and pressure altering protoliths into banded structures (foliated metamorphic).
High-grade regional metamorphism causes mineral segregation into distinct light and dark layers.
4
Identify the origin and characteristics of Rock Salt.
Rock salt forms through evaporation of saline water bodies (chemical sedimentary evaporite) and is used in industrial chemical processes.
Chemical sedimentary rocks precipitate directly out of saturated aqueous solutions.

Key Concept

Rock Classification by Formation Mode and Economic Importance
Estimated Time:1m 30s
Question 59Question →

During wave refraction along an irregular, indented coastline featuring alternating resistant headlands and weaker rock bays, orthogonal wave energy lines bend as water depth decreases near the shore. Which of the following correctly describes the distribution of wave energy and its resulting geomorphic effect along this coastline?

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Answer: Wave energy converges on headlands causing intensified erosion, while wave energy diverges within bays leading to sediment deposition.

Answer

Wave energy converges on headlands causing intensified erosion, while wave energy diverges within bays leading to sediment deposition.
As deep-water waves approach an indented coastline, the section of the wave front off headlands enters shallow water first and slows down due to bottom friction. This causes the wave crests to bend (refract), concentrating wave orthogonals and energy onto the headlands, which drives high rates of hydraulic erosion. Conversely, in the deeper water of bays, the wave energy diverges over a wider area, creating low-energy environment suitable for sediment deposition and beach formation.

Step-by-Step Solution

1
Analyze the mechanics of wave refraction along an indented coastline.
Waves drag on the shallow seabed in front of headlands first, slowing down while the deeper parts of the wave front in bay areas continue moving faster.
Friction with the sea floor decreases wave speed in shallow water near headlands.
2
Determine the direction of wave orthogonals (energy paths).
Wave rays bend toward the headlands, causing energy lines to converge on headlands and spread out (diverge) inside bays.
Wave refraction redirects wave energy perpendicular to the shoreline contours.
3
Correlate energy concentration with geomorphic coastal features.
Convergence at headlands leads to high-energy destructive wave action (forming cliffs, caves, arches), while divergence in bays results in low-energy constructive wave action (forming beaches).
High energy density accelerates marine erosion, whereas low energy density promotes sediment deposition.

Key Concept

Wave Refraction and Coastal Energy Distribution
Question 60Question →

A meteorologist at a meteorological station needs to determine the atmospheric pressure of the locality. Which weather instrument should be used for this measurement?

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Answer: Mercury barometer

Answer

Mercury barometer
Atmospheric pressure is the force exerted by the weight of the air column above a unit area. It is measured using a mercury barometer or aneroid barometer, expressed in units of millibars (mb) or millimeters of mercury (mmHg).

Step-by-Step Solution

1
Identify the target weather element from the prompt.
The parameter to measure is atmospheric pressure.
The station objective specifies determining air pressure.
2
Match atmospheric pressure to its standard measuring instrument.
Atmospheric pressure is recorded using a mercury barometer.
Barometers measure the weight per unit area exerted by the atmosphere, typically recorded in millibars (mb).

Key Concept

Atmospheric Pressure Measurement
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