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| | Hot Springs - Yellowstone National Park (Site not responding. Last check: 2007-09-19) |
 | | As the hot water travels through this "natural plumbing system," the high temperatures dissolve some of the silica in the rhyolite, yielding a solution of silica within the water. |
 | | At the surface, these silica-laden waters form a rock called geyserite, or sinter, creating the massive geyser cones; the scalloped edges of hot springs; and the expansive, light- colored, barren landscape characteristic of geyser basins. |
 | | Hot springs with names like Morning Glory, Grand Prismatic, Abyss, Emerald, and Sapphire, glisten like jewels in a host of colors across the parks harsh volcanic plain. |
| www.nps.gov /yell/nature/geothermal/hotsprng.htm (390 words) |
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