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...(425 to 6500 ft), where temperatures are low enough for the formation of [[permafrost]], and in the uppermost part of deep-water sediments below the sea floor at ...kquote>...current estimates of the amount of gas in the world's marine and permafrost gas hydrates accumulations are in rough accord at about 20,000 trillion m<s

...ronment. The offshore use of some techniques is possible, particularly for permafrost delineation and shallow marine geotechnical investigations. ...s include the measurement of ice thickness, the location of cracks in ice, permafrost studies, the detailed mapping of the bedrock surface, the examination of so

...bare karst, covered karst, soddy karst, buried karst, tropical karst, and permafrost karst. Tropical karst or cone karst only occurs in tropical areas, while permafrost karst only occurs in snowy climates.

* permafrost http://ipa.arcticportal.org/resources/what-is-permafrost