| A | B |
|---|
| Continental Drift | Hypothesis that large land masses are moving from one place on Earth to another. |
| Plate Tectonics | Theory that Earth's crust is fractured and moves along the surface of the mantle. |
| Convergent Boundary | Where two plates meet. |
| Divergent Boundary | Where two plates separate. |
| Transform Boundary | Where two plates move along side one another but do not separate nor push into each other. |
| Crust | Top layer "equivalent" in depth to a piece of paper around a basketball. |
| Lithosphere | Earth's upper-most "rock" layer. |
| Mantle | Earth's mostly liquid rock layer from which magma and lava come and to which subducting plates return -- convection currents here may drive plate tectonics. |
| Outer Core | Liquid iron core -- convection currents here may drive Earth's magnetic field. |
| Inner Core | Made of solid iron. |
| Subduction Zone | Area where the denser plate goes under the less dense plate. |
| Mountain Building | When two plates of equal density collide. |
| Earthquakes | Form near subduction zone and over "hot spots" in the mantle. |
| Mid-Oceanic Ridges | Locations of separating plates. |
| Magnetic Striping | Bands of rock that show opposing directions for Earth's magnetic poles. |
