| Term | Definition |
|---|
| fossil | preserved remains of an ancient organism |
| glossopteris | an extinct no longer living plant whose fossils can be found on many continents |
| pangaea | the single giant landmass that existed 200 million years ago |
| A. Wegener and his theory of continental drift | the theory proposedby Alfred Wegener that the continents were once together and have since drifted apart |
| midocean ridge | a mountain range under the ocean |
| ocean floor spreading | the process in whichd old floor is pushed away from a midocean ridge |
| rift valley | found in the middle of midocean ridges |
| trenches | deep v-shaped valleys |
| subduction | the process in which the crust plunges back into the earth |
| plate | irregularly shaped slabs that fit together |
| lithosphere | the topmost layer of the earth |
| divergent boundary | a boundary at which plates move apart (constructive boundary) |
| convergent boundary | a boundary at which plates move together (destructive boundary) |
| strike slip boundary | a boundary at which two plates slide past each other (lateral fault) |
| convection currents | movement caused by differences in temperature |
Combine with other sets
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