Yellowstone: Top Photos

Geysers, bison herds, and wild landscapes that teach kids the power of nature

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 mats line the runoff channels of Grand Prismatic Spring — these are the thermophiles responsible for the color rings visible from the overlook. Up close, they look almost like a painting. © pedrik, CC BY 2.0, via Wikimedia Commons

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