Introduction to Volcanoes

Earth Science - Middle School

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Table Of Contents: Introduction to Volcanoes

1. Magma Formation
Magma is a mixture of liquid rock, gases and water formed from intense heat and pressure in the Earth's mantle.
2. What Is a Volcano?
A volcano forms when magma moves through the crust and erupts onto the surface of the Earth. Magma that flows onto the Earth's surface is called lava. Layers of cooled lava harden into rock and build up on the earth's surface around a volcano.
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