The mantle is the thickest layer of the Earth at 2,900km thick. It makes up nearly 80% of the volume of the Earth. The mantle itself is divided into 2 layers, the upper and lower mantles and the heat within these layers drives convection currents. The upper mantle is semisolid rock called magma that flows slowly due to convection currents. It is less than 1,000°C in temperature. The lower mantle is kept solid due to pressure and is between 1,000-3,500°C. If you had to describe the mantle as a whole, it is classed as aliquid.
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