How Do Volcanoes Form?

A volcano is...

• any opening in Earth's crust where melted rock reaches the surface.
• a mountain with holes.
• a place where geysers explode.
• an underground mountain

A cinder cone mountain is primarily made of 

• rock
• lava rock
• rock and ash
• ash

A composite volcano is made up of

• lava rock
• ash and rock
• alternating layers of lava and ash
• ash

The difference between lava and magma is

• that lava is beneath the Earth's surface and magma is outside of Earth's surface
• that magma is beneath the Earth's surface and lava is outside of Earth's surface
• nothing. They are the same.

A shield volcano is a volcano that

• has a gentle slope and is made mostly of layers of lava rock
• is made up mostly of ash and rock

What is the cloud above an active volcano called?

• Ash cloud
• Bunsen burner
• Crater

What are the 3 characteristics by which volcanoes are grouped?

• Size, intensity, density
• Eruption, shape, structure

Cinder cone volcanoes usually erupt only one time.

• True
• False

Composite volcanoes are shaped like a

• cone
• gentle sloped mountain

Three ways scientists describe volcanoes:

• alive, dead, asleep
• extinct, dead, awake
• active, dormant, extinct