A fairly flat area of land formed over millions of years due to the wearing down of ancient mountains by erosion. Such long-term erosion, called denudation, often results from the action of rivers and may leave areas of more resistant rock, which stand up as monadrocks or residual hills. The peneplain concept was first discussed by the geomorphologist William Morris David (1850–1934).
Related categories GEOGRAPHY
• GEOLOGY AND PLANETARY SCIENCE
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