- Continental Drift- states that cintinents have moved
- Pangaea- all lands
- Panthalassa- all seas
- Mid-Atlatic Ridge- an undersea mountain range with a steep, narrow valey running down its center
- The earths crust consists of two types, Oceanic crust and continental crust
- convergant boundry is when the direct colision of one plate with another
A divergent boundary occurs at the point where two plates are moving away from each, creating more crust at the point of separation.
The trnasform boundary forms where two plates are grinding past eachother.
THe convection Current caused by the expansion of a liquid, solid, or gas as its temperature rises. The expanded material, being less dense, rises, while colder, denser material sinks.
Convection is a mode of heat transfer which includes the movement of the molecules of the material.
Sea-floor spreading is the process in which the ocean floor is extended when two plates move apart. As the plates move apart, the rocks break and form a crack between the plates. Earthquakes occur along the plate boundary. Magma rises through the cracks and seeps out onto the ocean floor like a long, thin, undersea volcano