Volcanoes and Their Hazards

What is the term for magma that remains underground in horizontal layers?

• Laccoliths

• Dykes

• Parasite cones

• Sills

What might happen if magma enters an existing vent but cannot dislodge the plug?

• It forms a dyke

• It remains as a laccolith

• It creates a parasite cone

• It forms a sill

What type of lava flow is characterized by being highly fluid?

• Lahar

• Pyroclastic flow

• Pahoehoe flow

• Aa flow

What is the best course of action if caught in an area during a pyroclastic flow?

• Move to the ridges

• Hide in a cave

• Stay in the valleys

• Run towards the flow

What is the size range of lapilli?

• Less than 2 millimeters

• Exactly 64 millimeters

• 2 to 64 millimeters

• More than 64 millimeters

Which volcanic rock is known for being light and porous due to gas release?

• Scoria

• Pumice

• Basalt

• Granite

What natural disaster was caused by a lahar from Mount Ruapehu in 1953?

• The Tangiwai disaster

• The Napier earthquake

• The Christchurch earthquake

• The Taupo eruption

What can trigger a volcanic landslide besides an eruption?

• Low humidity

• High temperatures

• Strong winds

• Heavy rainfall

What secondary effect can result from an eruption on offshore islands?

• Lahar

• Pyroclastic flow

• Lava flow

• Tsunami

What phenomenon can ash clouds from volcanic eruptions generate?

• Earthquakes

• Tornadoes

• Electrical fields

• Hurricanes