Why do mantle plumes tend to concentrate beneath supercontinents such as Pangaea?
A) Concentrations of radioactive materials build up as continents assemble.
B) Partial melting from subduction concentrates large volumes of magma.
C) A large landmass acts as an insulating blanket to trap heat in the mantle.
D) Friction from converging landmasses heats up the mantle.
Answer: C
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