Mud volcano steams in Yellowstone National Park in Wyoming. Sulphur and steam rise in vapors from cauldron.

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Size: 4256px × 2832px
Photo credit: © Bonita Cheshier / Alamy / Afripics
License: Royalty Free
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Keywords: attraction, boiling, cauldron, chemistry, geological, geothermal, heat, hot, hydrothermal, mud, national, park, steam, sulphorous, sulphur, tourism, travel, vapors, volcano, wyoming, yellowstone