The earth structure diagram shows that the earth is divided into four major components: the crust, the mantle, the outer core, and the inner core. Each layer has a unique chemical composition, physical state and can impact life on Earth’s surface. If we subdivided the Earth based on rheology, we see the lithosphere, asthenosphere, mesosphere, outer core, and inner core. However, we lump the layers into the crust, mantle, outer core, and inner core if we differentiate the layers based on chemical variations. As described in the Earth structure diagram, the core is the thickest layer of the Earth, and the inner core is the thinnest layer of the Earth. The crust is 5-35km thick beneath the land and 1-8km thick beneath the oceans.