This is an image of Mt. St. Helens, in Washington, USA.
Click on image for full size
Image from: USGS, courtesy of Volcano World
Volcanoes
Volcanoes are large eruptions that come from deep in the Earth's core. When they erupt, they spew out lava which flows out until it hardens into rock. There are presently thousands of volcanoes, but only a few of them ever become large enough to cause massive destruction. Scientists are sometimes able to predict volcanoes, but they have no exact theory of why one might erupt.
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