Not an exciting photograph, but a part of the Yellowstone landscape.

Although extremely hot and dangerous, the mud does not bubble because it is boiling. Instead, the popping and bubbling is the result of gases coming up from the underground plumbing of a thermal feature.

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Any and/or all usage or copying of this image, without express written permission from the photographer, is prohibited by law. Copyright 2006, Elizabeth Bickel. All Rights Reserved.