The mantle of the Earth is the layer located between the crust and the core, and it is composed of solid rock that is constantly moving and flowing due to heat generated from the Earth's core. It is divided into the upper mantle and the lower mantle, with the upper mantle being closer to the Earth's surface and the lower mantle being closer to the core. The mantle plays a crucial role in the movement of tectonic plates and the formation of volcanic activity.
