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[Anomalocaris]

The Atlantic Ocean will not keep on widening indefinitely.    Detailed modeling of thermal evolution of the crust and the forces acting on them suggest in very roughly 50-100 million years, the currently passive plate margin between eastern edge of the north and South American continental crust on the western side and the western edge of european and African continental on the eastern side, with the oldest part of the oceanic crust on the bottom of the Atlantic next to them, will develop into active normal faults.   The forces causing the faulting comes from the gradual increase in the density of the oceanic crust as it sheds the heat of its volcanic creation at oceanic ridge and cools,  coupled with the gravitational weight of up to 10 miles of sediments washed off the nearby continents and accummulated over 150 million years.     These causes the oceanic crust to become significantly more dense than the hot mantle rock underneath them and permit the oceanic crust to sink back into the mantle once detached from the continent through faulting,    When this happens, subduction trenches will form all around the perimeter of the Atlantic Ocean, the direction of movement of all the continent around the Atlantic will reverse, and then Atlantic will stop expanding and gradually close up.