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Permafrost temperature profile. Permafrost occupies the middle zone, with the active layer above it, while geothermal activity keeps the lowest layer above freezing. The vertical 0 °C or 32 °F line denotes the average annual temperature that is crucial for the upper and lower limit of the permafrost zone, while the red lines represent seasonal temperature changes and seasonal temperature ...
Permafrost is found on palsa mires only in the palsas themselves, and its formation is based on the physical properties of peat. Dry peat is a good insulator, but wet peat conducts heat better, and frozen peat is even better at conducting heat.
The middle zone is permanently frozen as "permafrost". And the bottom layer is where the geothermal temperature is above freezing. Note the importance of the vertical 0 °C line: It denotes the bottom of the active layer in the seasonally variable temperature zone and the bottom limit of permafrost as the temperature increases with depth.
Similarly, the area of individual permafrost zones may be limited to narrow mountain summits or extend across vast Arctic regions. [33] The ground beneath glaciers and ice sheets is not usually defined as permafrost, so on land, permafrost is generally located beneath a so-called active layer of soil which freezes and thaws depending on the ...
Scientific and medical terms in Interlingua are largely of Greco-Latin origin, but, like most Interlingua words, they appear in a wide range of languages. Interlingua's vocabulary is established using a group of control languages selected as they radiate words into, and absorb words from, a large number of other languages.
Definition page from Amy Pope's 'A medical dictionary for nurses' (1914) A medical dictionary is a lexicon for words used in medicine. The four major medical dictionaries in the United States are Mosby's Dictionary of Medicine, Nursing & Health Professions, Stedman's, Taber's, and Dorland's. Other significant medical dictionaries are ...
Periglaciation (adjective: "periglacial", referring to places at the edges of glacial areas) describes geomorphic processes that result from seasonal thawing and freezing, very often in areas of permafrost. The meltwater may refreeze in ice wedges and other structures.
Permafrost is permanently frozen ground found in periglacial zones. Permafrost may also refer to: Permafrost, a 2019 novella by Alastair Reynolds "Permafrost" (story), a 1987 Hugo Award winning novelette by Roger Zelazny; Permafrost: Literary Journal, the student newspaper of the University of Alaska Fairbanks English department