Which of the Following Is Correct Regarding Permafrost

Multiple Choice

Which of the following is correct regarding permafrost?

A) It develops where soil or rock temperatures are below freezing for at least two years.
B) It primarily occurs in areas covered with glaciers.
C) The surface layer of permafrost never thaws, even in the warm season.
D) It tends to occur at lower elevations in the midlatitudes than in the high latitudes.