What is the main method of heat transfer from the core to the crust of earth?
a) conduction
b) convection
c) insulation
eliminate
d) radiation

The answer to this question is letter  B. Convection.

>Mantle's convection is thought to make up about eighty percent of the internal heat flow to the surface, while the remainder originates in the crust.
>The main means of heat transfer is convection. This  process requires that the substance can behave like a "fluid", and the earth's mantle does.