| A | B |
|---|
| Pangaea | giant landmass that existed 200 million years ago |
| Theory of continental drift | theory that continents were once together |
| Alfred Wegener | proposed the continental drift theory |
| Glossopteris | extinct plant |
| Ocean-floor spreading | forms new ocean floor |
| transform faults | run across a midocean ridges |
| midocean ridges | undersea mountain range when new ocean floor is made |
| divergent boundary | plate boundary where plates move apart |
| convergent boundary | plate boundary where plates come together |
| plate | moving slab that makes up the Earth's crust |
