单词	esker
释义	esker /ˈɛskə / noun Geology A long ridge of gravel and other sediment, typically having a winding course, deposited by meltwater from a retreating glacier or ice sheet.Wetlands may overlie important groundwater aquifers, especially on moraines, eskers, and fluvioglacial deposits.... The long sand and gravel bodies called eskers were formed in subglacial cave-like tunnels where sand and gravel were deposited by flowing water. A large interior plateau contains dense forests, thousands of lakes and peat bogs, and rocky infertile soils associated with a glacially modified landscape with numerous drumlins and eskers. Origin Mid 19th century: from Irish eiscir.
随便看	biospelaeology biospeleology biosphere biosphere reserve biospheric biostasis biostatic biostatical biostatics biostatistical biostatistician biostatistics BioSteel biostratigrapher biostratigraphic biostratigraphical biostratigraphically biostratigraphy biostromal biostrome biosurgery biosynthesis biosynthesised biosynthesize biosynthesized

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