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A layer of frozen soil on the earth’s surface is known a Permafrost
 the answer is c)Permafrost

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Answer:

c. permafrost

Explanation:

    Permafrost is a type of soil that occurs in the polar regions. This name is called soil that remains frozen (temperature below 0 ° C) for at least two consecutive years. The term "permafrost" was first proposed in 1943 by scientist SM Muller.

    Sediments, rocks, debris permeated by ice constitute the permafrost soil. About a quarter of the earth's surface is under this type of soil. Especially in high altitude regions, permafrost is often obscured by the apparent landscape.

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