permafrost  search
RTactive layer
 creep
 cryopedology
 engineering geology
 engineering properties
 freezing
 frost action
 frost heaving
 frozen ground
 glacial geology
 ground ice
 hummocks
 ice
 ice cores
 ice lenses
 ice wedges
 periglacial features
 geomorphology
 pingos
 relict materials
SNUsed for geotechnical studies of permafrost as well as geomorphological and glacial studies.