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CH3
Term | Definition |
---|---|
continental drift | the hypothesis that the continents slowly move across the Earths surface |
pangaea | the name of the single land mass that began to break apart 200 million years ago |
fossil | the preserved remains or traces of an organism that lived in the past |
mid ocean range | an under sea mountain chain where new ocean floor is produced |
sea floor spreading | the process by which molten material adds new oceantic crust to the ocean floor |
deep ocean trench | a deep valley along the ocean floor beneath which oceantic crust sinks |
subduction | the process by which crust sinks beneath a deep ocean trench |
plate | a section of the lithosphere that slowly moves over the asthenosphere |
divergent boundary | a plate boundary where to plates move away from each other |
convergent boundary | a plate boundary where 2 plates move toward each other |
transform boundary | a plate boundary where two plates move past each other in oposite directions |
plate tectonics | the theory that pieces of earths lithosphere are in consistent motion |
fault | a break in earths crust which rocks move |
rift valley | a deep valley that forms where two places move apart |