| Term: | Cryofront |
| Definition: | The boundary between cryotic and non-Cryotic Ground as indicated by the position of the 0C isotherm in the ground. The Permafrost Base and the boundaries between noncryotic and cryotic portions of the Active Layer constitute Cryofronts. The Freezing Front may lag behind the Cryofront as it moves downwards during annual freezing of the Active Layer as a result of freezing-point depression. |