Volcanic Hazard

It contains dissolved gases, which provide the driving force that causes most volcanic eruptions.

• pyroclastic flow
• ash fall
• magma
• lava

It is an Indonesian term that describes a hot or cold mixture of water and rock fragments that flows down the slopes of a volcano and typically enters a river valley.

• lava

• pyroclastic flow

• volcanic bombs

• lahar

It contains a high-density mix of hot lava blocks, pumice, ash and volcanic gas which moves at very high speed down volcanic slopes, typically following valleys.

• pyroclastic flow
• ash fall
• ballistic projectile
• lahar

Which of the following is not a destructive characteristics of lahars?

• lahars move rapidly down valleys like rivers of concrete.
• lahars pick up material as they travel, which can cause damage to structures in their path
• lahars and excess sediment cause serious economic and environmental damage to river valleys and flood plains
• lahars can occur only with volcanic eruption

These are rocks that an erupting volcano may hurl into the air. These blocks and bombs travel like cannonballs and usually land within 2 km of the vent

• ash falls
• ballistic projectiles
• lahars
• magma