The main area (30 by 40 mile) of Yellowstone sits over an old volcano (caldera). The magna chamber below is close to the surface (3-8 miles underground). Water from the mountains melting snow sinks below ground and through cracks in the rock feed the over 10,000 geysers, steam vents, volcanic hot springs and mud volcanoes. There are quite a few locations in the park to view them. Hot Springs have boiling water that comes to the surface. Thermophiles micro organisms create the different colours of the hot springs. Colourless and yellow Thermophiles grow in the hottest water: orange, brown, and red Thermophiles thrive in cooler waters. The colourful grand prismatic spring is the world’s 3rd largest hot spring at more that 370ft across. If the underground plumbing is restricted then a geyser is formed. Take away
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