Question

cold, dense material sinks. material that is hot and less dense rises.
what is described by this statement?
conduction cells
convection cells
radiation cells
continental cells

Explanation:

Convection involves the movement of fluid (or material with fluid - like behavior) where warmer, less dense material rises and cooler, denser material sinks. Conduction is heat transfer through direct contact without bulk movement of the material. Radiation is heat transfer via electromagnetic waves. Continental cells are not related to this heat - driven material movement. So the statement describes convection cells.

Answer:

B. convection cells