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Difficulty: HardPhysical Geography of the World

Regarding the physical oceanography and relief features of the world's oceans, which of the following statements are correct?

  1. The thermocline is a distinct subsurface ocean layer characterized by a rapid decrease in water temperature with increasing depth.Answer
  2. B
    Equatorial surface ocean waters exhibit the highest salinity globally due to continuous high insolation and intense evaporation.
  3. Abyssal plains are exceptionally flat oceanic basins covered by fine-grained sediments, situated primarily between continental margins and mid-ocean ridges.Answer
  4. Deep sea trenches are long, narrow submarine depressions formed along convergent tectonic plate boundaries through subduction.Answer

Answer

The correct statements are those describing the rapid temperature drop in the thermocline layer, the location and sediment composition of abyssal plains, and the tectonic subduction origin of deep ocean trenches.
The statements defining the thermocline as a rapid temperature reduction zone, describing abyssal plains as flat sediment-covered basins between continental margins and ridges, and establishing ocean trenches as subduction-driven tectonic features are all factually accurate.

Step-by-Step Solution

1
Analyze thermal stratification of ocean water
Confirm that the thermocline marks the vertical boundary zone of rapid cooling beneath the warm surface mixed layer.
Solar heating primarily affects the upper surface layer, below which temperature declines sharply.
2
Evaluate ocean surface salinity factors
Recognize that despite high temperature, equatorial waters have lower surface salinity than subtropical belts because atmospheric convection produces heavy daily precipitation that dilutes surface waters.
Salinity depends on the balance between evaporation and fresh water input (precipitation and runoff).
3
Examine submarine relief features
Confirm that abyssal plains are smooth sediment-rich basins and oceanic trenches are linear deep troughs caused by plate subduction.
Tectonic activity and sediment deposition dictate ocean floor topography.

Key Concept

Physical Properties and Relief Features of the Ocean Floor
Estimated Time:1m 30s
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Topics

Physical Geography of the World

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