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Inside the Earth #2
| Term | Definition |
|---|---|
| continental drift | the hypothesis that the continents move slowly across Earth's surface |
| Pangaea | the name of the single landmass that broke apart 200 million years ago giving rise to today's continents |
| fossil evidence | preserved evidence of organisms that give clues to the types of plants and animals that lived on Earth in the past |
| mid-ocean ridge | an undersea mountain chain where new ocean floor is produced |
| deep-ocean trenches | a deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle |
| subduction | the process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent boundary |
| plates | sections of the lithosphere that slowly move over the asthenosphere |
| plate tectonics | the theory that pieces of Earth's lithosphere are in slow, constant motion, driven by convection currents in the mantle |
| divergent boundary | a plate boundary where two plates move away from each other |
| rift valley | a deep valley on land that forms where two plates move apart at a divergent boundary |
| 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 opposite directions |
Created by:
Rita.Rogers
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