Volcanoes

What is the melted rock in volcanoes called?

• crust

• granite

• mantle

• magma

Mount St. Helens, which erupted in March, 1980, is in —

• Italy

• Hawaii

• Japan

• Washington

How are the volcanic islands of Hawaii different from most volcanoes?

• They have not erupted in thousands of years.

• They spew forth rocks and high clouds of ash rather than lava.

• They began at the bottom of the seafloor millions of years ago.

• They are at the center of a plate rather than where two plates meet.

What is a dormant volcano?

• a volcano that will never erupt again

• an inactive volcano that will erupt again

• a volcano that has a steep-sided dome shape

• a volcano that forms from lava, cinders, and ash

What is the “Ring of Fire”?

• a region around a volcano where people cannot live

• a group of GPS satellites used to predict volcanic eruptions

• the opening at the mouth of a volcano that has recently erupted

• the area at the edge of the Pacific plate where many volcanoes occur