• A hot spring forms where a crack in the Earth allows water to reach the surface after being heated underground.
  • Many hot springs are used by people and animals as natural hot tubs.
  • Some people believe that hot springs can cure illnesses.
  • Only about 1,000 geysers exist worldwide.
  • Old Faithful at Yellowstone National Park erupts every 60 to 70 minutes.
  • Castle Geyser is another geyser at Yellowstone Park; however, it does not erupt as frequently or predictably as OldFaithful.
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