Question

In the Earth's mantle, heat is transferred in large convection currents. Within these currents,

A.cooler and hotter rock rise but do not sink.
B.hotter and cooler rock sink but do not rise.
C.hotter rock rises and cooler rock sinks.
D.cooler rock rises and hotter rock sinks.

Answer 1

C. hotter rock rises and cooler rock sinks.

Step-by-step explanation:

While convection is generally discussed as a form of heat flow within liquids and gases, it can occur in solids too. For example, the temperature and pressure conditions in the Earth's mantle allow mantle rock to flow very slowly. Hotter rock gradually rises up and cooler rock gradually sinks down in large convection currents in the mantle.

Answer 2

C. The hotter rock rises and the cooler rock sinks

Heat rises and as the warmer rock gets further away from the superheated center of the Earth it begins to cool off and starts to sink back toward the superheated center of the Earth where it is reheated and the whole process starts over again. That is what a convection current is.