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USGS CMG InfoBank: Glacial Deposits

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Comment: 17:13 - 17:58 (00:45)
Source: Annenberg/CPB Resources - Earth Revealed 23. Glaciers
Keywords: continent, "ice sheet", glacier, "glacial ice", "glacial melt", "glacial flow", moraine, till, drumlin, lake, basin, kettle, esker, civilization, silt, loess, "fertile soil", deposition

Our transcription: Across the interiors of continents, the ice sheets left moraines hundreds of kilometers long.
Streamlined mounds of till, known as "drumlins," were sculpted by flowing and melting ice.
Thousands of lake filled basins, called "kettles," were caused by the melting of ice buried in till.
Sinuous ridges of sediments left by sub-glacial streams, known as "eskers," wind across the land.
Most important to our modern civilization, however, are the wind-blown deposits of glacial silt, or "loess," which have weathered to form rich farmland soil.

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Page Last Modified: Thu Oct 31 04:27:48 PDT 2013  (chd)