A bowl-shaped are that may form at the top of a volcano around the central vent.

These help make a volcano explode under great pressure.

Both eruptions can cause damage to this.

This has created the islands of Hawaii.

These drift away from this.

Magma moves upward through this long tube that extends from Earth's crust up through the top of the volcano.

This is a material found in magma that forms from the elements oxygen and silicon.

These can mix.

This creates land-forms of tons of different materials.

This is how long a volcano lives?

Molten lava and gas leave the volcano through this opening.

These eruptions produce different types of lava.

They can cause thick layers of lava.

This is a different type of land-form.

This is when a volcano is erupting.

This is the spread of lava as it pours out of a vent.

DAILY DOUBLE!!!!! This is the temperature of lava that can range from this amount of Celsius and hot enough to melt copper.

This is a mixture hot gases, ash, cinders, and bombs.

This is a type of volcano.

This is a sleeping volcano.

Magma collects in this.

This is the type of eruption that happened with Mount St. Helens.

This is mud, melted snow, and rock.

This creates volcanic necks, dikes, sills, dome mountains, and batholiths.

This type of lava is low in silica, very hot and very runny.