Advertisement Upgrade to remove ads

volcano

a weak spot in the crust where magma has come to the surface

magma

a molten mixture of rock-forming substances, gases, and water from the mantle

lava

magma that reaches Earth's surface

Ring of Fire

a major belt of volcanoes that rims the Pacific Ocean

island arc

A string of islands formed by the volcanoes along a deep ocean trench

hot spot

unusually hot region of the mantle which causes rock to melt, rise, and form a volcano

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set