Geologists Mark Severson (left) and John Heine measure temperatures in the earth during geothermal research conducted by the Natural Resources Research Institute of the University of Minnesota Duluth and the University of North Dakota. Their study found that geothermal heat is closer to the surface and in much greater supply in parts of Minnesota than previous studies had found.
Read the article: Study finds Minnesota's geothermal energy potential is greater than previously thought
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