Glossary

Made up of tiny bits of rocks and gas that are brought to Earth's surface in a volcanic eruption. Often appears in a powdery form

Also known as the main vent where magma travels from the magma chamber to the Earth's surface

A partially or mostly burned substance, such as rock, wood, etc.

The outermost layer of the Earth

To happen or begin suddenly and violently; to send out rocks, ash, lava, etc.

Rock that in its molten form (as magma) issues from volcanos; lava is what magma is called when it reaches the surface

Molten, or hot liquified rock underneath the Earth's surface

A large pool where magma collects in the mantle underneath Earth's crust

The layer underneath Earth's crust, made up of magma

Side vents, also known as secondary vents, in a volcano allow some of the magma and gases to escape but are not the main vent where the eruption takes place.