Vocabulary

Continental Drift- the movement of continents which moves the crustal plates (Alfred Wegener)

Mid Ocean Ridges- a long mountain range on the bottom of the seafloor (Harry Hess)

Sea-Floor Spreading- the process were new oceanic crust is formed by magma at mid-ocean ridges, where the magma keeps on replacing the old ocean floor (Harry Hess)

Pangaea- a supercontinent made out of all the landmasses in earth (Alfred Wegener)

Plate Tectonics- very large sections on earth's surface that move very slowly (Harry Hess)