Yellowstone Geology
June 7th 2019 Yellowstone is situated on an active volcano! Three major eruptions have occurred in the last 2.1 million years, the most recent only 650,000 years ago. Magma only 3-8 miles down provides the heat for the thermal features in Yellowstone. The Upper Geyser Basin, home of old faithful, is one of 3 large geyser basins along the Firehole River. We were there on a sunny day and we treated to eruptions f
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