Sea Floor Spreading- The process which molten material adds to the crust
Divergent boundary - A plate boundary where two plates move away from each other
Convergent boundary - A plate boundary where two plates move toward each other
Deep Ocean Trench- A deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle
Plate tectonics - The theory that pieces of Earth's lithoshpere
Pangaea- The name of the single landmass that to break apart over 200 million years ago
Rift Valley - A deep valley that forms where two plates move apart
Subduction- The process by which oceanic crust sinks under the mid ocean trench
Mid Ocean Ridge- An undersea mountain chain where new ocean floor is produced.
Fossil- The preserved remains of an organism that lived in the past.
Continental drift- The hypothesis that continents slowly move across Earths surface.
Transform Boundary - A plate boundary where two plates move past each other in opposite directions
Ideas to understand
evidence for pan