| Term: | Active permafrost |
| Definition: |
Permanently frozen ground (permafrost) which, after thawing by artificial or unusual natural means, reverts to permafrost under normal climatic conditions; opposed to passive permafrost. AMSglossary
GCW |
| Term: | Active permafrost |
| Definition: | Permanently frozen ground (permafrost) which, after thawing by artificial or unusual natural means, reverts to permafrost under normal climatic conditions; opposed to passive permafrost. |