The difference in density of oceanic and continental plates is as a result of
Subduction.
Subduction is referred to as a geological process that involves the plate
tectonics of a crustal plate descending below the edge of another. This
process continues and helps in the formation of the earth's layers.
Subduction varies according to the type of materials or soil used and the
conditions in which their formation took place. This difference brings about
varying densities in the oceanic and continental plates.
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