What term describes ground that remains frozen year-round for more than two consecutive years?

What term describes ground that remains frozen year-round for more than two consecutive years?

• A. Tundra
• B. Permafrost
• C. Soil moisture
• D. Mantle

Answer: (B)

Permafrost describes ground that stays frozen year-round for more than two consecutive years. It lies beneath an active, seasonally thawed layer on top, so the surface may soften in summer while the subsurface remains permanently frozen. This feature is common in Arctic and subarctic regions and influences soil drainage, vegetation, and how water moves through the ground. Tundra is a cold, treeless biome, which often occurs where permafrost is present, but the term describes the ecosystem rather than the ground’s freezing state. Soil moisture refers to how much water is in the soil and isn’t about freezing. Mantle is a deep Earth layer far below the surface.

Permafrost describes ground that stays frozen year-round for more than two consecutive years. It lies beneath an active, seasonally thawed layer on top, so the surface may soften in summer while the subsurface remains permanently frozen. This feature is common in Arctic and subarctic regions and influences soil drainage, vegetation, and how water moves through the ground.

Tundra is a cold, treeless biome, which often occurs where permafrost is present, but the term describes the ecosystem rather than the ground’s freezing state. Soil moisture refers to how much water is in the soil and isn’t about freezing. Mantle is a deep Earth layer far below the surface.