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Unformatted text preview: OCEANS Deep ocean plain abyssal plain, for some it is the spreading center. Seamounts below sea level so we dont see them. mid atlantic ridge the MAR is up to 5 km high After spreading begun, southern part of atlantic starts to open up. 60 MYA, northern part of Atlantic began to open up. In the early 1800s, if youd asked a geologist where the deepest part of the ocean was they would have said it was in the middle. But central part of the ocean is shallower. Deepest part of the atlantic is in areas closer to the continents. Topographic comparisons of the A direct expression of where A the plates move apart the rising hot plastic mantle beneath the ridges begins to melt because when plates move apart, pressure is reduced, significant fraction of melting of mantle rocks due to pressure. Ocean spreading At ridges slow, and rises fast. Sea floor spreading goes on at different rates for different systems. The mid atlantic ridge is relatively slow spreading. the east pacific rise intersected by north America because north America is moving...
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