Visitors to Yellowstone get a (fun!) education in Geology 101. The whole park is a "caldera", a volcanic crater, with molten rock a mere three miles below the surface. Yellowstone has the largest and most diverse set of "geothermal features"" on earth.
"Geothermal features"? Learn these words; they include hot springs, geysers, mud pots, and fumaroles ("dry geysers" where steam and other gases are expelled from holes.)
Never, never, let a child or dog get close to a geothermal feature! Temperatures can exceed the boiling point.
"Geothermal features"? Learn these words; they include hot springs, geysers, mud pots, and fumaroles ("dry geysers" where steam and other gases are expelled from holes.)
Never, never, let a child or dog get close to a geothermal feature! Temperatures can exceed the boiling point.
Images 1-9 of 9
 Mammoth Hot Springs Terraces |  Mammoth Terraces (2) |  Mammoth Terraces (3) |  Hot Spring |
 Hot Springs (2) |  A Belching Dragon |  Mud Volcano, on Mud Volcano Trail |  Old Faithful Geyser |
 Old Faithful Geyser, Crowd Watching |
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