Volcanic Activity and Eruptions

Front

Which statement is supported by the information in the image?

Back

Many volcanoes are on the eastern coasts of North and South America.

Front

Which statement describes convergent boundaries?

Back

Subduction occurs.

Front

Which feature forms at a divergent boundary?

Back

rift valley

Front

Which feature is created on the exterior of a volcano when it erupts?

Back

crater

Front

Which event causes a volcanic eruption?

Back

explosions occurring in magma chambers

Front

Which statement explains what happens as magma rises inside a volcano?

Back

The magmatic pressure decreases.

Front

A volcano erupts, and lava flows down a mountainside. Which statement best describes this eruption?

Back

This is a quiet eruption caused by low-viscosity magma.

Front

Which phrase best describes Mount St. Helens' eruption in 1980?

Back

high-viscosity magma

Front

Which label best describes the image of a volcano erupting at night?

Back

Explosive eruption—beware of ash!

Front

Which word identifies one stage of volcanic activity?

Back

dormant