Explanation:

Permafrost is any ground that remains completely frozen—32°F (0°C) or colder—for atleast two years straight.These permanently frozen grounds are most common in regions with highmountains and in Earth’s higher latitudes—near the North and South Poles. Permafrost covers large regions of the Earth. Almost a quarter of the land area in theNorthern Hemisphere has permafrost underneath.
Permafrost is made of a combination of soil, rocks and sand that are held together byice. The soil and ice in permafrost stay frozen all year long.Near the surface, permafrost soils also contain large quantities of organic carbon—amaterial leftover from dead plants that couldn’t decompose, or rot away, due to the cold. Lower permafrost layers contain soils made mostly of minerals. A layer of soil on top of permafrost does not stay frozen all year. This layer, called the active layer, thaws during the warm summer months and freezes again in the fall. Hence both statements are correct.