DANIEL SAMBRAUS / SCIENCE PHOTO LIBRARY DANIEL SAMBRAUS / SCIENCE PHOTO LIBRARY
Geothermal pool. Colourful water caused by minerals dissolved in the hot water or a geothermal pool. Geothermal pools form in areas where volcanic activity causes hot water to rise up from beneath the Earth's surface. Photographed at the Cuatro Cienegas biological reserve, Mexico.
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