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All images were found on Google Images!

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The word volcano originally comes from the name of the Roman god of fire, Vulcan.

Volcanoes are openings in the Earth’s surface. When they are active they can let ash, gas and hot magma escape in sometimes violent and spectacular eruptions.

Volcanoes are usually located where tectonic plates meet. This is especially true for the Pacific Ring of Fire, an area around the Pacific Ocean where over 75% of the volcanoes on Earth are found.

While most volcanoes form near tectonic boundaries, they can also form in areas that contain abnormally hot rock inside the Earth. Known as mantle plumes, these hotspots are found at a number of locations around the globe with the most notable being in Hawaii.

Hot liquid rock under the Earth’s surface is known as magma, it is called lava after it comes out of a volcano.

While we certainly have some big volcanoes here on Earth, the biggest known volcano in our solar system is actually on Mars. Its name is Olympus Mons and it measures a whooping 600km (373 miles) wide and 21km (13 miles) high.

http://www.sciencekids.co.nz/sciencefacts/earth/volcano.html

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I learned that volcanoes are opening in the Earth's surface.

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Forming new rock