| A | B |
|---|
| Large pieces of the lithosphere that move around on the asthenosphere | tectonic plates |
| Earthquakes | Type of tectonic activity that occurs at all boundaries |
| Oceanic Lithosphere | High density |
| Speed of tectonic plates | centimeters per year |
| Used to measure the speed of tectonic plates | GPS |
| Are produced from continental-oceanic collisions | volcanic mountains, deep ocean trenches, and earthquakes |
| sea floor spreading occurs here | mid-ocean ridges |
| Where two plates collide | convergent boundary |
| Where two plates separate | divergent boundary |
| Where two plates move horizontally past each other | transform boundary |
| The area where denser oceanic lithosphere sinks beneath continental lithosphere | Subduction Zone |
| When oceanic lithosphere slides downhill due to gravity | Ridge Push |
| Process where denser oceanic lithosphere pulls the rest of the tectonic plate with it into the asthenosphere | Slab pull |
| Rising of hot, less dense magma & sinking of cooler, denser magma | Convection |
| Alfred Wegener's hypothesis of why the continents seemed to fit together like a puzzle | Continental Drift Hypothesis |
| 1. Mountains 2. Glacial Scarring 3. Continents fit 4. Coal deposits 5. fossil match | Evidence for Continental Drift |
| Pangaea | Wegener's name for supercontinent |
| The process of forming new oceanic lithosphere as magma rises to the surface at mid-ocean ridges | Sea-floor spreading |
| 1. Magnetic reversals 2. Depth of earthquakes near trenches 3. Age of sea floor | Evidence for Sea-Floor Spreading |
| Volcano that forms from a mantle plume in the middle of a tectonic plate | Hot spot |
