![](http://www.alamy.com/thumbs/6/B89BB7C2-7C4A-45F5-9ED1-30C0FDA221AC/2DFANWJ.jpg)
Geothermal activity creates steam at the hot sulfur pools of BUMPASS HELL in LASSEN NATIONAL PARK - CALIFORNIA
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Photo credit: © McPhoto/Lovell / Alamy / Afripics
License: Licensed
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