Yellowstone: Top Photos

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

Travertine terraces in Mammoth Hot Springs, Yellowstone National Park, Wyoming, United States
Travertine terraces at Mammoth Hot Springs, built layer by layer as mineral-rich geothermal water cools and deposits calcium carbonate. The colors shift depending on which microbes are currently active — the terraces look different every visit. © Frank Schulenburg, CC BY-SA 4.0, via Wikimedia Commons

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