Mantle
The layer above the inner core is the mantle. It begins about 6 miles (10 km) below the oceanic crust and about 19 miles (30 km) below the continental crust. There are 2 parts of the mantle, the inner mantle and the outer mantle ( Lithosphere & Asthenosphere ). It is about 1,800 miles (2,900 km) thick and makes up nearly 80 percent of the Earth's total volume. The mantle is made of solid rock and lava with temperatures between 2520 ºF (1400ºC) and 5400 º F (3000ºC). In the mantle there are convection currents. Convection currents are made up of two parts, a cold part and a warm part which cycle. The solid rock from the mantle rotates because the bottom part sinks, the further it sinks, the closer it gets to the hot inner core which causes it to heat up and melt. Once it's in a melted state it is lighter, being light and hot cause it to rise again. Once it starts rising it comes away from the hot inner core and starts to cool off as it gets closer to the earth's crust. As it cools down and re-hardens, becoming cool and heavy makes it sink again and so it continues the cycle.