Topic
Volcanic hazards
4 questions tagged Volcanic hazards — spanning every one of the seven Ws.
what
What is a volcanic bomb?
A volcanic bomb is a blob of molten or semi-molten rock ejected during an eruption that solidifies while flying through the air.
VolcanoesVolcanic hazards
what
What is a pyroclastic surge?
A pyroclastic surge is a fast-moving, turbulent cloud of hot gas, ash, and rock fragments from a volcano.
VolcanoesVolcanic hazards
how
How do volcanoes create ash clouds?
Explosive eruptions shatter magma into tiny fragments as trapped gas expands violently. The fragments are blasted high into the air and become volcanic ash.
GeologyVolcanic hazards
what
What is lahars?
A lahar is a fast-moving volcanic mudflow made of water mixed with ash, rock and debris. It can travel far from a volcano and bury valleys and towns.
Earth scienceVolcanic hazards