| Term: | Sporadic discontinuous permafrost |
| Definition: | 1. (North-American usage) Permafrost underlying 10 to 35 percent of the exposed land surface; 2.< (Russian usage) Permafrost underlying 5 to 30 percent of the exposed land surface |
| Term: | Sporadic discontinuous permafrost |
| Definition: | Permafrost underlying 10 to 35% of the exposed land surface. Individual areas of Permafrost are completely surrounded by Unfrozen Ground. |
| Term: | Sporadic discontinuous permafrost |
| Definition: | (1) (North American usage) permafrost underlying 10 - 50% of the exposed land surface (2) (Russian usage) permafrost underlying 5 - 30% of the exposed land surface. |