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Difficulty: MediumInternal and External Structure of the Earth

The Earth's total physical environment is composed of internal structural layers and external environmental spheres. Which of the following correctly identifies a feature or process belonging to the Earth's external structure?

  1. The interaction within the atmosphere, hydrosphere, and surface lithosphere where rocks undergo in-situ chemical and physical disintegrationAnswer
  2. B
    The downslope displacement of surface regolith caused directly by internal mantle magmatic heat currents
  3. C
    The oceanic deposition of sediments that transforms subterranean magma directly into metamorphic rocks
  4. D
    The asthenospheric zone where continental crustal rocks undergo thermal weathering in-situ

Answer

The interaction within the atmosphere, hydrosphere, and surface lithosphere where rocks undergo in-situ chemical and physical disintegration
The external structure of the Earth comprises the atmosphere, hydrosphere, biosphere, and the outermost surface of the lithosphere. Weathering is an external process taking place in-situ at this interface under atmospheric influence.

Step-by-Step Solution

1
Classify the Earth's structure into internal and external realms
The internal structure consists of concentric layers (crust, mantle, and core/barysphere), while the external structure consists of outer spheres (atmosphere, hydrosphere, biosphere, and surface lithosphere).
Geographical concepts distinguish between deep sub-surface layers driven by internal heat and surface envelopes exposed to atmospheric agents.
2
Analyze the operational processes of the external spheres
Processes operating within the external structure involve solar energy, climate, and water, leading to in-situ weathering of surface lithospheric rocks.
Weathering is an exogenic (external) process occurring where the atmosphere and hydrosphere contact the exposed lithosphere.

Key Concept

Earth's External Structure and Exogenic Processes
Estimated Time:1m 0s
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Topics

Internal and External Structure of the Earth

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