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Answer:
Dense water sinks below less dense water. This is the principle that drives the deep ocean currents that circulate around the world. A combination of high salinity and low temperature near the surface makes seawater dense enough to sink into the deep ocean and flow along the bottom of the basins.
The answer is the ocean-continental convergence. This is where the gold of the Inca civilization come from.
It all depends on how long it has been moving without that information it cannot be answered