Yellowstone: Top Photos

The caldera that powers half the world's geysers

Orange microbial mat of photosynthetic thermophiles in the runoff waters of the Grand Prismatic Spring. The spring can be seen in the background covered in vapor.
Orange microbial mat of photosynthetic thermophiles in the runoff waters of the Grand Prismatic Spring. The spring can be seen in the background covered in vapor. © pedrik, CC BY 2.0, via Wikimedia Commons

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