rock altered by pressure and heat
lines that run east and west dividing the earth (accross)
Distance east or west of the prime meridian, measured in degrees (up and down)
a type of rock that forms from the cooling of molten rock at or below the surface
molten rock beneath the earth's surface
Please allow access to your computer’s microphone to use Voice Recording.
We can’t access your microphone!
Click the icon above to update your browser permissions above and try again
Reload the page to try again!
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.
Your microphone is muted
For help fixing this issue, see this FAQ.
NEW! Voice Recording
Click the mic to start.