Question

When denser materials replace lighter material, we refer to this as

Answer 1

Answer:

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.