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replacing silly with reality
[[Image:Grand prismatic spring.jpg|right|thumb|300px|Grand Prismatic Spring in Yellowstone National Park.]]
[[Image:Grand prismatic spring.jpg|right|thumb|200px|Grand Prismatic Spring in Yellowstone National Park.]]
'''Hot spring''' is natural hot tub.
A '''hot spring''' is a natural phenomenon where underground [[water]] is heated by [[geothermal]] energy and then flows out through the surface of the [[earth]]. Many places that have hot springs have been developed as [[spa]]s or [[resort]]s.