R-sea floor spreadin

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Term Definition
sea floor spreading the process where mid ocean ridges continually adds new material to the ocean floor
deep ocean trenches in a process taking tens of millions of years, parts of the ocean floor sinks back into the mantle at deep ocean trenches
subduction the process by which the ocean floor sinks beneath a deep ocean trench and back into the mantle again.
divergent boundary plates move apart, or diverge from each other
convergent boundary plates come together, or converge.
transform boundary plates slip past each other.
plate tectonics states that earths plates are in slow constant motion driven by convection currents in the mantle.
rift valley where pieces of earths crust diverge on land a deep valley forms.

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