Create an account
idea suggested by Alfred Wegener that states that a giant landmass known as Pangaea gradually split apart and the continents moved to their present location.
theory of plate tectonics
states that the Earth's lithosphere (land), is broken into large sections called tectonic plates that move and change position over time.
when tectonic plates are pulled apart. These ocean plates create new seafloor and undersea mountains called mid-ocean ridges. These boundaries on land can produce volcanoes.
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 and try again
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