Part of speech: noun

The wearing away of rocks, as by water.

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Usage examples "erosion":

  1. There was sand and brush over everything, even the rocks had a thin coating of their own erosion. - "Duel on Syrtis", Poul William Anderson.
  2. The geologist is thus able to determine by the land forms of any region the stage in the erosion cycle to which it now belongs, and knowing what are the earlier stages of the cycle, to read something of the geological history of the region. - "The Elements of Geology", William Harmon Norton.
  3. Evidence afforded by the after effects of forest fires in other parts of the Cascades indicates that the destruction of the forest on the mountain sides is followed by erosion. - "The Forests of Mount Rainier National Park", Grenville F. Allen.