Many of the bright colors found in Yellowstone’s hydrothermal basins come from thermophiles—microorganisms that thrive in hot temperatures. So many individual microorganisms are grouped together—trillions! —that they appear as masses of color.
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Yellowstone – Boardwalks
Every year, thousands of pairs of feet anxiously scurry across more than 14 miles of Yellowstone National Park’s iconic, wooden boardwalk system, eager to ferry their owners to an up close and personal glimpse of hundreds of natural hydrothermal springs and geysers.