Why is the oceanic crust much younger than the continental crust? the ocean basins did not begin forming until after the breakup
of Pangaea it is eroded away by ocean currents it is constantly recycled through subduction processes it is only formed after a volcanic eruption somewhere under the ocean
A push factor would be something like war or famine or something. A pull factor would be something like a job or new opportunity, its usually for financial reasons in my opinion. Hope this helped!
