Question

Convection is the movement of material that distributes heat in the Earth's mantle. What arrangement of material may lead to convective motion?
A.
denser material on top of less dense material
B.
mixed material with a uniform temperature
C.
less dense material on top of denser material
D.
mixed material with a uniform density
vConvection is the movement of material that distributes heat in the Earth's mantle. What arrangement of material may lead to convective motion?
A.
denser material on top of less dense material
B.
mixed material with a uniform temperature
C.
less dense material on top of denser material
D.
mixed material with a uniform density

Answer 1

A. denser material on top of less dense material

This arrangement is gravitationally unstable: the heavier material will sink and the lighter material will rise, producing convective motion (as in the mantle where heated, less-dense material rises and cooler, denser material sinks).