Thermal Features in Yellowstone National Park

The crest of the pool

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Crested pool has about a 3 inch high "crest" around it. Here the pool is bubbling violently, sometimes it is boiling, sometimes it is calm.
Date: July 14, 2019
Location: Upper Geyser Basin, Yellowstone National Park, WY

Copyright 1994-2023, G. Edward Johnson. All rights reserved.