| Term: | Seasonally-active permafrost |
| Definition: | The uppermost layer of the permafrost which undergoes seasonal phase changes due to the lowered thawing temperature and freezing-point depression of its pore water |
| Term: | Seasonally-active permafrost |
| Definition: | The uppermost layer of the permafrost which undergoes seasonal phase changes due to the lowered thawing temperature and freezing-point depression of its pore water. |