Valley

Posted: 30 April 2001

Depression in the land surface often occupied by a river. In geology, the chief agency in the formation of a valley is erosion carried on by the running streams and assisted by the natural decay or weathering of the rocks in which the channels lie."Valley," Microsoft® Encarta® Online Encyclopedia 2001http://encarta.msn.co.uk © 1997-2001 Microsoft Corporation. All rights reserved.