Bill Nye - Volcanoes

What is the main cause of volcanoes erupting?

• Gases trapped in the magma

• A sudden increase in temperature

• Earthquakes shaking the ground

• Heavy rainfall seeping into the earth

How were the Hawaiian Islands formed?

• By underwater earthquakes

• By the collision of tectonic plates

• By a stream of extremely hot magma called a magma plume

• By meteor impacts

What happens when a volcano's magma chamber fills up?

• The bottom of the caldera rises

• The volcano gets colder

• It turns into a lake

• The volcano turns into a mountain

What is a caldera?

• A small volcano

• A stream of lava

• A huge bowl formed when volcanoes stop erupting

• A type of explosive eruption

What type of volcano is formed by hot lava that flows quickly down the sides?

• Shield volcano

• Composite cone

• Strata cone

• Cinder cone

What causes some volcanoes to ooze lava rather than explode?

• The type of gases trapped in the magma

• The presence of water in the earth's plates

• The thickness of the earth's crust

• The temperature of the magma

What is the role of tectonic plates in the formation of volcanoes?

• They provide a path for magma to reach the surface

• Their movement has no effect on volcanoes

• They prevent volcanoes from erupting

• They absorb the magma preventing eruptions

What happens to the lava after it cools off?

• It becomes water

• It forms new land

• It turns back into magma

• It disappears into the air

Why do plants start growing in cracks on volcanic landscapes?

• Because the ash provides protection

• Because that's where water collects

• Because the soil is richer in nutrients

• Because it's warmer