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It seems like crust is being produced in more areas than it is being subducted. Certain specific examples are also interesting, such as the African plate.Africa is allegedly being converged on by plates spreading from the east, south, and west, yet it exhibits no evidence whatsoever for the existence of subduction zones.Scholl and Marlow (1974), who support plate tectonics, admitted to being "genuinely perplexed as to why evidence for subduction or offscraping of trench deposits is not glaringly apparent." In order to maintain their theory, plate tectonicists have had to resort to the notion that unconsolidated deep-ocean sediments can easily slide under overlying plates without being scraped off or leaving any other significant trace behind.
This is a problem because subduction cannot be used to explain the movement of certain massive continental plates such as the Eurasian plate.It has long been theorized that the driving forces of plate movements are deep convection currents that well up beneath the mid-ocean ridges and then circle back down beneath the ocean trenches.The problem with this theory is that the mantle appears to be horizontally layered.It is somewhat like trying to pull a train engine with dental floss.The theory of subduction has other problems as well.