A theory stating that the earth's surface is broken into plates that move.
The supercontinent formed near the end of the Paleozoic era when plate movements brought all the landmasses of Earth together.
An undersea mountain chain where new ocean floor is produced; a divergent plate boundary.
Sea floor spreading
The process that creates new sea floor as plates move away from each other at the mid-ocean ridges
Depression formed at a subduction zone.
The process of one plate going under another.
A giant ocean wave that forms after a volcanic eruption, submarine earthquake, or landslide.
Shaking and vibration at the surface of the earth resulting from underground movement along a fault plane of from volcanic activity.
A crack in the earth's crust resulting from the displacement of one side with respect to the other.
The point on the Earth's surface directly above the focus of an earthquake.
The point beneath Earth's surface where rock breaks under stress and causes an earthquake.