| Term: | Permafrost base |
| Definition: | The lower boundary surface of permafrost, above which temperatures are perennially below 0 degrees Celsius (cryotic) and below which temperatures are perennially above 0 degrees Celsius (noncryotic). |
| Term: | Permafrost base |
| Definition: | The lower boundary surface of permafrost, above which temperatures are perennially below 0˚C (cryotic) and below which temperatures are perennially above 0˚C (noncryotic) |
| Term: | Permafrost base |
| Definition: | The lower boundary surface of Permafrost, above which temperatures are perennially below 0C (cryotic) and below which temperature are perennially above 0C (non-cryotic). |