What is convection and how is it related to the mantle?
Convection is a heat transfer where warm air goes up and cold air goes down.
Mantle is made is made mostly of the elements Magnesium, Silicon, Oxygen, and Iron. The mantle is more dense than the outermost layer of the earth. The density of the mantle increases with depth. This increase in density is due to the greater percentage of iron in the lower mantle. This causes the convection current.