Which of the following layers of soil is a mixture of sand, silt, and clay and consists mainly of minerals and leached materials such as iron and aluminium compounds?
A
Top soil
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B
Bedrock
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C
Subsoil
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D
Weathered rock material
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Solution
The correct option is C Subsoil The uppermost layer of soil is called topsoil. Below the topsoil is the subsoil, which is a mixture of sand, silt, and clay and consists mainly of minerals and leached materials such as iron and aluminium compounds. Below the subsoil is the third layer made of weathered rock material. The fourth and final layer of the soil is the bedrock or the parent rock from which the soil is formed.