Vocabulary

•Continental Drift- the very slow movement of the continents on the surface of the Earth (Ortilius, Wegener)
•Mid Ocean Ridges- an elevated region with a central valley on an ocean floor at the boundary between two diverging tectonic plates (Hess)
•Sea-Floor Spreading- At mid-ocean ridges of the tectonic plates underlying the oceans upwelling, from the earth's interior, magma solidifies and adds to the spreading plates. (Hess)
•Pangaea- land area believed to have once connected nearly all of the earth's landmasses together. (Ortilius, Wegener)
•Plate Tectonics- a scientific theory that the Earth's surface is made of very large plates that move very slowly (Ortilius, Wegener, Hess)

Seafloor spreading

Pangaea