Geyser
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A geyser is a spring characterized by an intermittent discharge of water ejected turbulently and accompanied by steam. As a fairly rare phenomenon, the formation of geysers is due to particular hydrogeological conditions that exist only in a few places on Earth.
Strokkur geyser, Iceland
Image: Geyser exploding 1 large
Image: Geyser exploding 2 large
Image: Geyser exploding 4 large
Spring (hydrology)
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A spring is a natural exit point at which groundwater emerges out of the aquifer and flows onto the top of the Earth's crust (pedosphere) to become surface water. It is a component of the hydrosphere, as well as a part of the water cycle. Springs have long been important for humans as a source of fresh water, especially in arid regions which have relatively little annual rainfall.
On an average day nearly 303 million US gallons (1,150,000 m3) of water flow from Big Spring in Missouri at a rate of 469 cubic feet per second (13.3 m3/s).
Grand Prismatic Spring, Yellowstone National Park, Wyoming
A natural spring on Mackinac Island in Michigan
Sunrise at Middle Spring, Fish Springs National Wildlife Refuge, Utah