Create an account
a force that slowly wears away mountains and other features on the surface of Earth
A vibration that travels through earth carrying the energy released during an earthquake
the solid, outer layer of the earth that consists of the crust and the rigid upper part of the mantle
The solid, plastic layer of the mantle beneath the lithosphere; made of mantle rock that flows very slowly, which allows tectonic plates to move on top of it
the liquid layer of the Earth's core that lies beneath the Mantle and surrounds the inner Core
An undersea mountain chain where new ocean floor is produced; a divergent plate boundary.
a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return
a deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle
the process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary
A well tested explanation for a wide range of observations or experimental results
the theory that pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle
the boundary between tectonic plates that are sliding past each other horizontally
A tectonic plate boundary where two plates collide, come together, or crash into each other.
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