At least 1,500 active volcanoes dot the globe, and some of them have been continuously erupting for years.
They form when molten rock called magma up and breaks through a weak area of Earth's surface. The chambers that contain magma can quietly lurk underground for hundreds of years, and then erupt with surprising fury. Here are some amazing facts
Source:
http://www.livescience.com/environment/crazy-volcanoes-facts-100416.html
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