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The word volcano comes from the Roman god of fire, Vulcan. Volcanos are
basically openings in the Earth’s surface -- that unlike other openings -- are formed
when underground magma pushes its way to the surface. Once the magma come
out of the opening, then it’s called lava instead of magma.
Volcanos are generally categorized according to how they are formed and their
activity level. More than 75% of the volcanoes on Earth are located in area around
the Pacific Ocean called the Pacific Ring of Fire. The largest known volcano in our
solar system is on the planet Mars. Its name is Olympus Mons and it measures 373
miles wide and 13 miles high.
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