At a depth of a few meters, the temperature of soil approaches the annual average for its location. Shown are the temperature deviations from the mean annual temperatures with depth in dry, average, and wet soils.
(Virginia Department of Mines Minerals and Energy Earth Temperature and Site Geology. U.S. Department of Energy, State Energy Program, http://www.geo4va.vt.edu/A1/A1.htm, accessed November 20, 2009.)
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