Volcanoes and Volcanic Materials

Front

Volcano

Back

Any place where gas, ash, or melted rock comes out of the ground.

Front

Magma

Back

Molten rock beneath the Earth's surface.

Front

Lava

Back

Liquid magma that reaches the surface.

Front

Vent

Back

An opening of a volcano.

Front

Viscosity

Back

A liquid's resistance to flow.

Front

Pyroclastic materials

Back

Volcanic rocks ejected during an eruption, including ash, bombs, and blocks.

Front

Shield Volcanoes

Back

Gently sloping mountains formed by thin, runny lava. As the lava spreads and cools, it forms a shield shape like a gladiator's shield.

Front

Cinder Cones

Back

Small, steep-sided volcanoes that erupt gas-rich, basaltic lava.

Front

Composite Volcanoes

Back

A tall, cone-shaped mountain in which layers of lava alternate with layers of ash and other volcanic materials.