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Soil is formed by the breaking of rocks and the decay of trees, plants, and animals. It may take as long as 500 years to make just one inch of topsoil. Unwise and wasteful farming methods can destroy that inch of soil in just a few short years. In addition, rainstorms may carry thousands of pounds of precious topsoil away and dissolve chemicals that are necessary to grow healthy crops through a process called erosion. Soil scientists work with engineers to address these issues.