Layers of the Earth
Did you know the Earth is like an onion? It has layers!
Lithosphere - thin, outermost shell of the mantle, similar to the crust, "floats" on the asthenosphere
Asthenosphere - softer, semi-solid layer of the mantle that is constantly moving slowly, this motion is the force behind plate tectonics which creates continental drift, earthquakes, volcanoes, mountains, and trenches.