A rock formed when small particles of magma are blown from the vent of a volcano by escaping gas.

Rock. A rock formed by the accumulation of fragments of volcanic rock scattered by volcanic explosions.

A general term for any volcanic material that is ejected as broken solidified fragments of rock.

A rock that is composed of fragmented volcanic products ejected from volcanoes in explosive events.

Pyroclastic rocks or pyroclastics (derived from the Greek πῦρ, meaning fire, and κλαστός, meaning broken) are debris thrown from volcanoes during an eruption. It consists of fresh lava that has risen to the surface or older volcanic material that has remelted and has been expelled into the air by the explosion.