The document discusses the layers of the Earth and compares them to items like burgers and sandwiches. It notes that the Earth has three main layers - the crust, mantle, and core. The crust is the outermost layer that humans live on, made of lighter rock. The mantle is the largest layer, made of hot, dense rock that flows like asphalt. The core is mostly made of very hot metals, with an inner solid core within a liquid outer core.