esker
es·ker
E0212200 (ĕs′kər)esker
(ˈɛskə) oreskar
es•ker
(ˈɛs kər)n.
es·ker
(ĕs′kər)| Noun | 1. | esker - (geology) a long winding ridge of post glacial gravel and other sediment; deposited by meltwater from glaciers or ice sheets |
| 单词 | esker | |||
| 释义 | eskeres·kerE0212200 (ĕs′kər)esker(ˈɛskə) oreskares•ker(ˈɛs kər)n. es·ker(ĕs′kər)
Eskeresker,long, narrow, winding ridge of stratified sand-and-gravel driftdrift,deposit of mixed clay, gravel, sand, and boulders transported and laid down by glaciers. Stratified, or glaciofluvial, drift is carried by waters flowing from the melting ice of a glacier. ..... Click the link for more information. . Eskers, many miles long and resembling abandoned railway embankments, occur in Scandinavia, Ireland, Scotland, and New England; they arose from deposition of sediment in the beds of streams flowing through or beneath glaciers. Eskera long, narrow ridge composed of horizontally or, more often, obliquely stratified sand, gravel, and pebbles and of boulders. Eskers are usually not longer than 40 km but occasionally exceed 500 km. Their width varies between several meters and 2 to 3 km, and their height can reach several dozen meters. Eskers are deposits left by meltwater flowing through valleys and tunnels that have been cut through a glacier. They are found in areas of Quaternary, or Anthropogenic, continental glaciation in Sweden, Finland, and the northern European part of the USSR. Eskerthe general name for aggradation glaciofluvial land-forms that formed within glaciers, such as oses, kames, and kame terraces. Some foreign scientists, such as R. Flint, use the term “esker” as a synonym for os. esker[′es·kər]esker
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