Science 9 Volcanoes and Eruptions Quiz

How do volcanoes become extinct?

• When magma has less temperature

• When the amount of magma decreases

• When magma from the earth stops moving

• When the source of magma was cut off due to plate movement

Which type of volcano is shown in the picture above?

• Stratovolcano

• Shield Volcano

• Composite Volcano

• Cinder Cone Volcano

Describe the shape of this type of volcano.

• Large and flat

• Broad and gently sloping

• Steep slope with wide crater

• Large and nearly perfect slope

What kind of eruption formed this type of volcano?

• Quiet eruptions

• Violent eruption

• Explosive eruptions

• Both quiet eruptions and explosive eruptions

Which among the images has the lowest viscosity?

• A

• B

• C

• A and B

Lava in image C is formed from _____ amount of gas and a silica content.

• low, low

• high, low

• low, high

• high, high

Which among the following is not a basic feature shared by all volcanoes if you were to explain this to Brien Dale?

• The magma collects in magma chambers that can be 160 kilometers beneath the surface.

• As the rock heats, it expands, which creates even more pressure causing the magma to seek a way out pushing toward the surface.

• Eruption of the magma on the surface is always violent and explosive due to the extreme heat and pressure.

• When magma reaches the surface, it comes out and is called an eruption

Which among the images will have an explosive eruption?

• A

• B

• C

• A and B

The eruption of Mount Pinatubo is classified as Plinian. Describe a Plinian type of eruption.

• Stream driven type of eruption

• Slow and quiet type of eruption

• Flowy and weak type of eruption

• Excessively explosive type of eruption

Why do earthquakes occur around a volcano before an eruption?

• Because of pyroclastic flow

• Because of the increase in the viscosity

• Because of the upward movement of magma

• Because the cooling of magma inside the crust