| A | B |
|---|
| Alfred Wegener | German scientist who created the continental drift theory |
| continental drift theory | the theory that explains the horizontal movement of the continents |
| Pangaea | word meaning "all land" |
| fossil clues | fossils of the same animal species have been found on separate continents |
| climate clues | fossils of tropical plants have been found in glacial regions |
| rock clues | similar rock structures and composition have been found on different continents |
| puzzle clues | the continents appear as though they would fit together like a puzzle |
| Harry Hess | the scientist who created the seafloor spreading theory |
| seafloor spreading theory | idea explaining how molten rock is forced upward from the mantle at the mid-ocean ridge, carrying the seafloor away from the ridge and spreading the seafloor |
| plate tectonic theory | theory stating that the Earth's crust and upper mantle are broken into sections |
| plates | the sections of the Earth |
| lithosphere | the layer of the Earth that is made of the crust and upper mantle |
| asthenosphere | the layer of the Earth that is below the lithosphere; it allow the plates to float |
| divergent plate boundary | the boundary where the plates move apart |
| convergent plate boundary | the boundary where the plates move together |
| transform fault boundary | the boundary where the plates slide past each other |
| subduction | when one plate is pushed beneath another plate |
| Rodinia | the "supercontinent" that formed before Pangaea |
| Walter & Luis Alvarez | scientists who explained the extinction of the dinosaurs |
