Boundaries, Plate Tectonics, Earthquakes

Divergent Boundary

A plate boundary where two plates move away from each other.

Transform Boundary

A plate boundary where two plates move past each other in opposite directions

Convergent Boundary

A plate boundary where two plates move toward each other.

Richter Scale

A scale that rates an earthquake's magnitude based on the size of its seismic waves.

Pangea

A supercontinent containing all of Earth's land that existed about 225 million years ago.

Seismic wave

A wave produced by an earthquake

Epicenter

Center point of Earthquake

Magnitude

How the intensity of an earthquake is measured

Lava

Magma that reaches Earth's surface

Continental Drift

The gradual movement of the continents across the earth's surface through geological time.

Fault

Where boundaries overlap, or a rack in a rock

Mid Ocean Ridge

a long, narrow ditch. An undersea mountain chain where new ocean floor is produced; a divergent plate boundary.

Pangea

term for the super continent which contained all the plates together