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Chapter 3
plate tectonics lessons 1-3
| Word | Definition |
|---|---|
| continental drift | the hypothesis that the continents slowly move across earths surface |
| pangaea | the name of the single landmass that began to break apart |
| fossil | the preserved remains or traces of an organism that lived in the past |
| mid-ocean ridge | an undersea mountain chain where new ocean floor is produced a divergent plate boundary |
| sea-floor spreading | the process by which molten material adds a new ocean oceanic crust to the ocean floor |
| deep-ocean trench | 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 plate boundary |
| plate | a section of the lithosphere that slowly moves over the asthenosphere carrying pieces of continental and oceanic crust |
| divergent boundary | a plate boundary where two plates move away from eachother |
| convergent boundary | a plate boundary where two plates move towards each other |
| transform boundary | a plate boundary where two plates move past eachother in opposite directions |
| plate tectonics | the theory that earths lithosphere is in constant motion driven by convection currents in the mantle |
| fault | a break in earths crust along which rocks move |
| rift valley | a deep valley that forms where two plates move apart |
Created by:
abelan001
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