When denser materials replace lighter material, we refer to this as A. Conduction current
B. Convection current
C. Continental drift
D. Continental Crust
E. Body wave

B. Convection current

Explanation:

When denser materials replace lighter materials, it is called convection current.

This is one of the driving mechanism of the plate motion between the crust and the mantle.

During convection, hot mantle molten rocks rises to the surface as they become lighter. Denser crustal rocks are colder and more solid packed, they sink further into the earth. This forms a series of convection cells driven by the high temperature of the mantle. The cyclic transition between these two plates corresponds to the convection current which carries heat way.

Therefore, the solution is convection current.

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