Volcanic Activity and Tsunami Effects

Volcanic eruptions are highly destructive, causing various deadly impacts. Lahars are mudslides formed by molten rock, ash, and melted ice. Underwater eruptions can trigger tsunamis, massive ocean waves that devastate coastlines. Volcanic ash, composed of tiny rock and glass fragments, poses health risks and can damage infrastructure. Volcanic bombs are large lava chunks that solidify in the air, posing injury risks. The most lethal effect is the pyroclastic flow, a fast-moving, hot mixture of gas and volcanic material that obliterates everything in its path.

What is a common consequence of volcanic eruptions?

• Increase in local wildlife

• Improvement in air quality

• Destructive impacts like lahars and tsunamis

• Formation of new mountains

What is a lahar?

• A type of pyroclastic flow

• A type of volcanic ash

• A large volcanic bomb

• A mudslide caused by a volcanic eruption

What materials combine to form a lahar?

• Sand and volcanic ash

• Ash, rocks, and melted ice

• Water and volcanic glass

• Lava and volcanic gases

How fast can tsunamis travel across the ocean?

• 100 miles per hour

• 200 miles per hour

• 700 miles per hour

• 500 miles per hour

What happens to tsunamis as they approach the coastline?

• They speed up and become smaller

• They remain unchanged

• They slow down and grow taller

• They disappear

What is volcanic ash composed of?

• Tiny fragments of rock and volcanic glass

• Large rocks and boulders

• Molten lava

• Water and sand

What health risk does volcanic ash pose?

• Skin irritation

• Lung damage

• Vision problems

• Hearing loss

What are volcanic bombs?

• Hot gases released during eruptions

• Large waves caused by eruptions

• Chunks of lava ejected from a volcano

• Small fragments of ash

What is the most deadly effect of a volcanic eruption?

• Volcanic bomb

• Pyroclastic flow

• Lahar

• Tsunami

How fast can a pyroclastic flow travel?

• 200 miles per hour

• 100 miles per hour

• 430 miles per hour

• 300 miles per hour