SIMON TERREY / SCIENCE PHOTO LIBRARY SIMON TERREY / SCIENCE PHOTO LIBRARY
Mineral deposits. Geyserite, clay and other mineral deposits in a hydrothermal area. Water superheated by geothermal activity dissolves many of the minerals in surrounding rocks underground. When the water escapes to the surface its power as a solvent is reduced, so the minerals are precipitated, forming deposits. Photographed at Yellowstone National Park, Wyoming, USA.
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