How Harry hess's hypothesis explain seafloor movement?

How Harry hess's hypothesis explain seafloor movement?
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Harry hess' hypothesis was hot/less dense material rises up theEarth's crust toward the mid-ocean ridges. When the seafloor breaksapart, magma is forced upward and through the cracks. It cools, andbecomes a new seafloor. When it moves away from the mid-oceanridge, it becomes denser and sinks. This helps form ridges.
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