Why do some volcanoes explode?

What volcano erupted in Washington in 1980, its first eruption in over 100 years?

• Mount St. Helens
• Mount Vesuvius
• Mount Everest
• Mount Kilimanjaro

Which describes a shield volcano?

• A type of volcano that is wide but not tall.

• A type of volcano that is dormant and inactive
• A type of volcano with no cone at all
• A type of volcano with a narrow, steep cone

A cone volcano is:

• Short and flat

• Wide and round with a smooth surface
• Narrow and twisted with a jagged edge
• Tall and steep with a cone shape

The rocks of the cone volcano, the kind that explodes, are all pale or light colored. They are called:

• gravel

• felsite

• basalt

• cement

What type of lava forms in a shield volcano?

• thin lava

• chunky lava

• thick lava

• smooth lava

After it explodes, a volcano can build itself back up again.

• true

• false

Shield volcanoes have a thin, runny lava that cools into a dark-colored rock called:

• Basalt
• Quartz
• Marble
• Granite

What creates the bubbles in lava?

• Molten metal
• Solid rock
• Gases

• Boiling water

Why do some volcanoes explode?

• Pressure from trapped gases and magma
• As a result of the type of rocks in the area
• Because of the temperature of the surrounding air
• Due to excessive rainfall

Which type of lava explodes?

• thick lava

• thin lava

• no lava

• all lava