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Difficulty: HardWeathering and Mass Wasting Processes

Match each weathering or mass wasting process on the left with its primary defining mechanism or environmental manifestation on the right.

  • HydrolysisChemical decomposition of silicate minerals such as feldspar into kaolinite clay through reaction with hydrogen ions
  • CarbonationDissolution of insoluble calcium carbonate in limestone by carbonic acid to produce soluble calcium bicarbonate
  • Frost ShatteringMechanical disintegration of jointed rock driven by repeated expansion of freezing water in fissures
  • SolifluctionSlow downslope flow of water-saturated active soil layer over impermeable permafrost in cold regions

Answer

Hydrolysis matches the chemical decomposition of silicate minerals into kaolinite clay; Carbonation matches the dissolution of calcium carbonate into soluble calcium bicarbonate by carbonic acid; Frost Shattering matches the mechanical disintegration of jointed rock by freezing water expansion; Solifluction matches the slow downslope flow of saturated soil over permafrost.
Each process matches its exact physical, chemical, or geomorphic behavior. Hydrolysis chemically converts silicate minerals like feldspar to kaolinite clay. Carbonation dissolves calcium carbonate into soluble bicarbonate using carbonic acid. Frost shattering mechanically disintegrates rock via the volumetric expansion of freezing water in joint spaces. Solifluction is the periglacial mass movement of waterlogged soil flowing over impermeable permafrost under gravity.

Step-by-Step Solution

1
Differentiate between in-situ chemical weathering, in-situ mechanical weathering, and downslope mass wasting processes.
Hydrolysis and Carbonation are identified as chemical weathering; Frost Shattering is identified as mechanical weathering; Solifluction is identified as mass wasting.
Chemical weathering alters mineral composition, mechanical weathering physically breaks rock without chemical change, and mass wasting involves movement of material downslope under gravity.
2
Analyze the chemical reactions for Hydrolysis and Carbonation to match their respective definitions.
Hydrolysis specifically targets silicate minerals like feldspar producing clay minerals (kaolinite), while Carbonation acts on carbonate rocks (limestone) using carbonic acid.
The reaction mechanism of hydrogen ions replacing cations distinguishes hydrolysis from the acid-dissolution dynamics of carbonation.
3
Evaluate the mechanical wedging mechanism vs. the mass movement process.
Frost Shattering relies on the 9% volume expansion of ice wedging in rock joints, whereas Solifluction requires saturated topsoil sliding over permafrost under gravity.
Frost shattering operates in-situ on rock outcrops, while solifluction represents flow transport of regolith down a slope.

Key Concept

Classification and underlying mechanics of physical weathering, chemical weathering, and mass wasting processes.
Estimated Time:1m 30s
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Topics

Weathering and Mass Wasting Processes

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