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Question

Difficulty: EasySoil Formation, Profiles, and Major Vegetation Types

During the initial phase of soil formation, solid rock undergoes physical disintegration and chemical decomposition without being transported from its original location. Which process specifically describes this in-situ breakdown of parent rock material?

  1. WeatheringAnswer
  2. B
    Mass wasting
  3. C
    Metamorphism
  4. D
    Marine deposition

Answer

Weathering is the process responsible for the in-situ physical and chemical breakdown of parent rock during soil formation.
The term weathering specifically denotes the physical disintegration and chemical decomposition of rocks in place (in-situ) at or near the Earth's surface, providing the foundational mineral material for soil profile development.

Step-by-Step Solution

1
Identify the key characteristic described in the stem
The breakdown occurs in-situ (without movement of the rock material).
Soil formation begins when parent material is broken down in place.
2
Distinguish between weathering and transport processes
Weathering acts in place, whereas mass wasting and erosion involve movement of rock waste.
In-situ disintegration defines weathering.

Key Concept

Weathering as an Initial Soil-Forming Process
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Topics

Soil Formation, Profiles, and Major Vegetation Types

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