<Dl> <Dd> h (t) ∼ h 0 − 390 t (\ displaystyle h (t) \ sim h_ (0) - 390 (\ sqrt (t))) </Dd> </Dl> <Dd> h (t) ∼ h 0 − 390 t (\ displaystyle h (t) \ sim h_ (0) - 390 (\ sqrt (t))) </Dd> <P> for the Atlantic and the Indian Ocean, where the height is in meters and time is in millions of years . To get the dependence on x, one must substitute t = x / v ~ Tx / L, where L is the distance between the ridge to the continental shelf (roughly half the ocean width), and T is the ocean age . </P>

Describe what happens at plate boundaries that are associated with seafloor spreading