Sea floor spreading can alter the sea level. whether sea floor spreading causes a rise or fall in sea level is related to the spreading rate. a rise in sea level would be caused by a
a) an older sea floor
b) a denser sea floor
c) a slow spreading sea floor
d) rapidly spreading sea floor

Sea-floor spreading is what happens at the mid-oceanic ridge where a divergent boundary is causing two plates to move away from one another resulting in spreading of the sea floor. As the plates move apart, new material wells up and cools onto the edge of the plates.

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