What Causes a Volcano to Erupt? | Owlcation

By Rickrideshorses
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Volcano eruptions happen when magma erupts from beneath the Earth’s crust. When a volcano erupts, the magma becomes lava and shoots into the air, eventually running down the side of the volcano.

To understand how and why volcanoes erupt, we must first understand the different layers of our planet.

The three layers of Earth are the core, mantle, and crust.
The three layers of Earth are the core, mantle, and crust.

The Layers of Planet Earth

Earth is made of three layers: the core, the mantle, and the crust. The core is comprised of inner and outer sections. The mantle has lower and upper mantle areas, too. The crust, though, consists of one main layer.

The Earth’s core is solid iron, and pressure in this

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