Part of the lithosphere, thicker, made of older rock, Part of the lithosphere, thinner, denser, made of newer rock, A rigid, solid layer made of rock. The outermost physical layer that is divided into tectonic plates, A solid layer made of weak rock that flows very slowly. The layers of the lithosphere move around the slow-flowing rock of this layer, Region of hot, slow-flowing, solid rock. Convection takes place to bring hot rock closer to the crust and colder rock closer to the core, The liquid layer of the Earth's core, A solid, dense center of the Earth.

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