Glossary of landform and geologic terms. 2013.
Frost boil — Mud boils near Lapporten, Sweden Frost boils (also known as mud boils, frost scars and mud circles [1]) are upwellings of mud that occur through frost heave and cryoturbation in permafrost areas, such as arctic and alpine regions. They are… … Wikipedia
Permafrost — This article is about frozen ground. For other uses, see Permafrost (disambiguation). In geology, permafrost, cryotic soil or permafrost soil is soil at or below the freezing point of water (0 °C or 32 °F) for two or more years. Ice is not always … Wikipedia
Nivation — is a collective name for the different processes that occur under a snow patch. The primary processes are mass wasting and the freeze and thaw cycle,[1] in which fallen snow gets compacted into firn or névé. The term glacier is applied only when… … Wikipedia
Talik — For the Israeli general named Talik, see Israel Tal. A talik (from the Russian Language talik, derived from the verb tait, to melt) is a layer of year round unfrozen ground that lies in permafrost areas. In regions of continuous permafrost,… … Wikipedia
Cryoturbation — Asphalt damaged by cryoturbation, or freezing of groundwater In gelisols (permafrost soils), cryoturbation (frost churning) refers to the mixing of materials from various horizons of the soil right down to the bedrock due to freezing and thawing … Wikipedia
Drunken trees — Not to be confused with the floss silk tree, also known as the drunken tree or palo borracho. A drunken forest in Siberia caused by melting permafrost. NASA photo. Drunken trees, tilted trees, or a drunken forest, is a stand of trees displaced… … Wikipedia
Frost weathering — A rock in Abisko fractured (along existing joints) possibly by mechanical frost weathering or thermal stress Frost weathering is a collective name for several mechanical weathering processes induced by stresses created by the freezing of water… … Wikipedia
Cryosuction — is the process in freezing soils whereby water migrates through soil pores to the freezing zone (through capillary action).[1] [2] In periglacial environments, this mechanism is highly significant. It is the predominant process in ice lens… … Wikipedia
Driftless Area — Relief map showing primarily the Minnesota part of the Driftless Area. The wide diagonal river is the Upper Mississippi River. In this area, it forms the boundary between Minnesota and Wisconsin. The rivers entering the Mississippi from the west… … Wikipedia
Herschel Island — is an island in the Beaufort Sea (part of the Arctic Ocean), which lies 5 km (3.1 miles) off the coast of Yukon, Canada, of which it is administratively a part. It is Yukon s northernmost point. Early history The earliest evidence of human… … Wikipedia
