| A | B |
|---|
| Evidence of continental drift 1. | 1. Similar fossils found in rocks on different continents |
| Evidence of continental drift 2. | 2. Similar rock structures found on different continents |
| Evidence of continental drift 3. | 3. Continents fit together like puzzles |
| Evidence of continental drift 4. | 4. Climate evidence, glacier groves moving in the same direction |
| seafloor spreading | new seafloor is formed when magma is forced upward toward the surface at a mid-ocean ridge; the Atlantic ocean is getting wider |
| ocean floor age | evidence for sea-floor spreading that proves that new rock forms close to the Mid-Atlantic Ridge and old rocks sink, melt, and reform at ocean basins |
| ocean-ocean convergent boundary | underwater convergent boundary between plates; one piece of crust slides under the other and forms a trench and a volcanic island arc; OLD CRUST is destroyed |
| ocean-continent convergent boundary | convergent boundary where ocean crust moves under continent crust and forms a trench; forms volcanic mountains along coast of continent and oceanic trenches further out in the ocean; OLD CRUST is destroyed |
| continent-continent convergent boundary | convergent boundary where both plates are land; forms mountains; OLD CRUST is destroyed |
| Ring of Fire | Extensive subduction zones in the Pacific Ocean basin, resulting in a ring of active volcanoes |
| continental continental divergent boundary | forms where two continental plates pull away from each other making NEW CRUST; Rift Valley can form |
| oceanic oceanic divergent boundary | forms where two oceanic plates separate (pull away) form each other making NEW CRUST; Mid-Ocean Ridge |
| Reversed Magnetic Signature | occurs at a mid-ocean ridge where magma rises, it aligns with the Earth's magnetic field before cooling, this showed the magnetic field switches throughout Earth's life |
| GPS (global positioning system) | a system that accurately determines the precise position of something on Earth and can measure the motion of the plates, was able to measure tectonic movement (2.5 cms per year) |
| What boundary do mountains occur at? | Continental Continental Convergent |
| What boundary do volcanoes occur at? | Oceanic Continental Convergent |
| What boundary do earthquakes occur at? | All of Them |
