Along what feature of the ocean floor does sea-floor spreading begin?

Sea-floor spreading occurs on the Mid-Ocean Ridge at a long divergent plate boundary. Convection currents push new rock from the mantle to the surface, pushing older rock out of the way. This pushes the rock further and further. The oldest rock, is, therefore, located by the North American and African continental shelves.

Master planned communities outside of chicago. note: population density means people living in an area per square mile. chicago, an urban and highly populated area has a much more higher density than a desert, amish community, settlement, or nomadic region.

Water flows along the east coast and across the western tropical pacific towards south america, while they both are directed towards that way,  el niño does not directly affect the southern flow of water along the coast.