| Term | Definition |
|---|
| theory of plate tectonics | Explains the formation, movement, and subduction of Earth's plates |
| plate boundaries | three kinds: divergent, convergent, transform--each with a different type of plate movement. |
| plate | a section of the lithosphere that slowly moves over the asthenosphere, carrying pieces of continental and oceanic crust |
| scientific theory | a well-tested concept that explains a wide range of observations |
| plate tectonics | the theory that pieces of Earth's lithosphere are in constant motion driven by convection currents in the mantle |
| fault | a break in Earth's crust where masses of rock slip past each other |
| divergent boundary | a plate boundary where two plates move away from each other |
| rift valley | a deep valley that forms where two plates move apart |
| convergent boundary | a plate boundary where two plates move toward each other |
| transform boundary | a plate boundary where two plates move past each other in the opposite direction |
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