This investigation will help you to:
Soil Quality Resource Concerns: Soil Erosion, NRCS
This PDF (you must have Adobe Acrobat to view this file) reviews what erosion is, how to detect signs of erosion, why erosion is a problem, and possible solutions to reducing soil erosion.
Soil Erosion - Index of Maps, Facts, and Figures, NRCS
This site contains a long list of soil erosion maps and tables, including data for wind and water erosion, and erosion on different types of soil. Map pages include color US maps as well as descriptions of the maps and definitions for "technical" terms.
Soil Erosion - Causes and Effects, Ministry of Agriculture and Food, Ontario, Canada
Discusses erosion by wind and erosion by water.