单词	glaciation
释义	glaciation /ˌɡleɪsɪˈeɪʃ(ə)n / noun [mass noun] Geology 1The process or state of being covered by glaciers or ice sheets.These hydrogeological conditions are controlled by relative land and sea level, erosion and deposition, the cold climate processes of permafrost and glaciation, and rock stress changes.... In Illinois, levels of diversity drop precipitously, most likely reflecting one or more genetic bottlenecks in areas that were once covered by the Wisconsin glaciation. Geologically young, the Rockies exhibit faulting, glaciation, and volcanism, resulting in rugged, spectacularly scenic terrain. 1.1 [count noun] A glacial period.Their study by others led to the discovery of multiple glaciations, separated by interglacial periods.... No polar glaciations are known during the Late Permian. Minor glaciations may also have taken place in the earlier Ordovician early Silurian and late Devonian.
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