This Natural Resource Conservation Service (NRCS) site has a link to the Field Indicators of Hydric Soils in the United States. It is an Adobe Acrobat file which is 1.7MB. This updated version 5.01...
This NIOSH Safety and Health Topic web page on trenching and excavation provides statistics and publications on this common construction hazard.
Using a cross-section of soil types, the students will describe what occurs when water comes in contact with the ground.
Department of Plant & Soil Sciences at the University of Idaho provides brief descriptions of 12 soil orders -- entisols, inceptisols, mollisols, alfisols, ultisols, oxisols, spodosols, vertisols,...
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