Q542
Permafrost is a layer where soil temperature is always
A.
≤ 0°C
AnswerB.
≠ 0°C
C.
0 to 100°C
D.
≤ 10°C
Answer: Option A
Solution
Answer: Option A
Solution:
Permafrost is a layer where the soil temperature is always ≤ 0°C. It is defined as ground with a temperature that remains at or below freezing (0°C) for two or more consecutive years. It is a permanently frozen layer on or under the Earth’s surface. It consists of soil gravel and sand, usually bound together by ice.