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Library Journal
Reviewed on April 1, 2007
It takes 500 years to create one inch of topsoil-it takes much less time to deplete the nutrients in soil or to strip soil of protective vegetation. Once that happens, wind and rain erode the topsoil so that, within a few generations, the land is unable to support cultivation. Montgomery (earth & space sciences, Univ. of Washington;King of Fish: The Thousand-Year Run of Salm...Log In or Sign Up to Read More