SOLAR SYSTEM

Detailed explanation-1: -Convection currents are identified in Earth’s mantle. Heated mantle material is shown rising from deep inside the mantle, while cooler mantle material sinks, creating a convection current. It is thought that this type of current is responsible for the movements of the plates of Earth’s crust.

Detailed explanation-2: -Convection currents in the mantle occur due to density differences caused by variations in temperature and composition. It consists of hotter and less dense mantle material rising while colder, denser material sinks.

Detailed explanation-3: -Many geologists believe that the mantle “flows” because of convection currents. Convection currents are caused by the very hot material at the deepest part of the mantle rising, then cooling, sinking again and then heating, rising and repeating the cycle over and over.

Detailed explanation-4: -It was Holmes, in 1919, who suggested the mechanism: that the continents are carried by flow of the mantle on which they sit, and that the mantle is flowing because it is convecting.