Snake River Plainsource : http://en.wikipedia.org/wiki/Snake_River_PlainThe eastern Snake River Plain traces the path of the North American plate over the Yellowstone hotspot, now centered in Yellowstone National Park. The eastern plain is a topographic depression that cuts across Basin and Range
mountain structures, more or less parallel to North American plate
motion. It is underlain almost entirely by basalt erupted from large shield volcanoes
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