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CH 1 Plate Tectonics
11 words
Term | Definition |
---|---|
the process when molten material adds new oceanic crust to the ocean floor | sea-floor spreading |
deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle | deep-ocean trench |
the process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent boundary | subduction |
a section of the lithosphere that slowly moves over the asthenosphere, carrying pieces of continental and oceanic crust | plate |
a break in Earth's crust where masses of rock slip past each other | fault |
a plate boundary where two plates move away from each other | divergent boundary |
a plate boundary where two plates move toward each other | convergent boundary |
a plate boundary where two plates move past each other | transform boundary |
an undersea mountain chain where new ocean floor is produced @ a divergent plate boundary | mid-ocean ridge |
the hypothesis that the continents slowly move across Earth's surface | continental drift |
the name of the single landmass that broke apart 200 million years ago and gave rise to today's continents | Pangaea |