6. which of the following describes the frozen underground soil that is found in the tundra a. polar ice c. permafrost b. hard frost d. emergent layer

C. Permafrost

Permafrost is the layer beneath the "active layer". The active layer consists of soil that freezes and thaws every year. However, the requirement for permafrost is that it be frozen for two or more years consecutively. This is why permafrost exists in cold environments such as tundras.