Answer :
The theory of plate tectonics explain the movement of the plates by convection cells in upper mantle.
Convection cells in the upper mantle layer serve as the basis for the movement of the continents according to the theory of plate tectonics.
The process can be explained simply by saying that convection cells exert a lot of pressure on the crust above, which is then affected by high temperatures and magma and can occasionally crack. The movement of the tectonic plates is actually caused by the crust cracking as it separates into its own entity and moves slowly in a certain direction under the immense pressure from underneath.
your question is incomplete but most probably your full question was
The theory of plate tectonics explains the movement of the plates by convection cells in which of the following layers
A.outer layer
B.upper mantle
C.inner core
D.crust
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