| Answer | Crossword Clue |
|---|---|
| permafrost | permanently frozen subsoil |
| permafrosts | PERMAFROST, permanently frozen subsoil |
| tundra | a level or rolling treeless plain that is characteristic of arctic and subarctic regions, consists of black mucky soil with a permanently frozen subsoil, and has a dominant vegetation of mosses, lichens, herbs, and dwarf shrubs |
| PERMAFROST | Continuously frozen subsoil of arctic regions |
| solifluction | The gradual movement of wet soil or other material down a slope, esp. where frozen subsoil acts as a barrier to the percolation of water |
