The Earth's mantle is made up of semisolid rocks. While different layers of the mantle are made of different kinds and densities of rocks, all are more dense than the crust, and the entire mantle is hot. The temperature of the mantle is hottest nearest the core, and cooler near the crust. read more
Earth's mantle is thought to be composed mainly of olivine-rich rock. It has different temperatures at different depths. The temperature is lowest immediately beneath the crust and increases with depth. read more