Volcanoes—Comprehension

What is Earth’s crust broken into?

• egg shells

• pans

• plates

• shields

How does a volcano form?

• when ice from glaciers build up

• when rocks build up around a mountain

• when lava pushes up through an existing mountain

• when a lot of lava flows out at one spot and forms a mountain

Volcanoes swell when

• air builds up inside it.

• there is too much rain.

• magma pushes up inside it.

• lava shoots out and falls back inside it.

What is the topic of the paragraph on page 344 of “Volcanoes”?

• Lava can destroy buildings.

• Volcanic ash does not cause problems.

• Hot lava from volcanoes can cause damage.

• Mount Saint Helens knocked down whole forests.

How can volcanic ash help the environment?

• It can be recycled.

• The wind carries ash.

• Animals can eat the minerals in it.

• Minerals in the ash can help plants grow.