Fast moving volcanic mudflow created through the combination of ash and water is called

Pyroclasts refers to ash, rock fragments and volcanic bombs ejected during volcanic eruption. When pyroclasts mix with super-heated gases ejected during volcanic eruption, this results in pyroclastic flow. Pyroclasts may then mix with water as it flows down the volcano. This gives rise to lahars which is a fast flowing mudflow created through the combination of pyroclasts(ash) and water. Thus, the combination of ash(pyroclasts) and water is called lahars.

NOTE: pyroclasts refers to ash

The answer is c) people evacuated but almost all returned