Permafrost underlies _______.
Introduction: Permafrost is continually frozen soil or rock layer that remains at or below 0°C for two consecutive years. About one fourth of the Northern Hemisphere land is underlain by permafrost. It is found in high altitudes and high latitudes.
Reason for correct answer:
Permafrost is found in the place having average annual temperature below -5°C. The arctic tundra has long cold winters and short cool summer. It forms between the polar icecap and the belts of boreal forests in the northern hemisphere. Therefore, permafrost lies beneath the arctic tundra.
Option b. is given as āarctic tundraā. Therefore, option a. is correct.
Reason for incorrect answer:
Option b. is given as āalpine tundraā. In alpine tundra, there is no permafrost...
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