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esker
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Esker
Narrow, steep-walled ridge, often meandering, found in formerly glaciated areas. It was originally formed beneath a glacier. It is made of sands and gravels, and represents the course of a river channel beneath the glacier. Eskers vary in height from 3 to 30 m/10 to 100 ft and can be up to 160 km/100 mi or so in length. Eskers are often used for roads as they are areas of high ground above marshy clay lowlands (glacial deposits).
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