| A | B |
|---|
| Alfred Wegener | proposed continental drift theory |
| Harry Hess | proposed sea floor spreading theory |
| convergent boundary | colliding boundary |
| divergent boundary | plates pull apart |
| transform boundary | sliding past each other (shear) |
| trench | formed by subduction movement |
| subduction | ocean material moves down at continental boundary |
| sea floor spreading | ocean pulling apart @Mid ocean |
| continental-continental | land-land collision |
| continental-ocean | ocean-land collision |
| ocean-ocean | forms volcanic arc& hot spots |
| mid ocean ridge | long mountain chain that contains the youngest rocks |
| rift valley | elongated crack found when crust splits |
| San Andreas fault | best example of transform fault |
| Normal Polarity | magnetism pointing to True N |
| Pangaea | "all land mass" single super continent |
| Volcanic Arcs | Aleutians, Hawaiian Islands |
| Magnetic reversal | rocks switching magnetism at the ocean floor |
| Glossopteria | ancient fossil fern found in S.A. & Africa |
| Lauria | Large land mass of Europe & Asia |
| mountains, volcanoes, ocean basins | formed when the Earth's plates collide |
| rift valleys and plate boundaries | where results of plate movement can be seen |
| rocks and fossils | support the idea of continental drift |
| Continental drift | continents move slowly; caused by seafloor spreading |
| convection current | cycle of heating, rising and sinking |
| Glomar Challenger | scientists on this ship sampled rocks from different locations |
| earthquakes | occur where plates slide past one another |
| Plate Tectonics | theory that Earth's crust and upper mantle are broken into pieces that float and move |
| lithosphere | rigid layer, less dense, 100 km thick |
| asthenosphere | plastic like layer that lithosphere floats on |
| plate | sections of the upper mantle |
| Mesosaurus | fossils of this reptile support Wegener's theory |
