* The crust: The crust is the outermost layer of the Earth and is composed of solid rock. The crust is typically 5-70 km thick and is made up of continental and oceanic crust. Continental crust is thicker and less dense than oceanic crust and is found on continents. Oceanic crust is thinner and denser than continental crust and is found on the ocean floor.

* The mantle: The mantle is the layer of the Earth located between the crust and the outer core. The mantle is composed of hot, dense rock and is approximately 2,900 km thick. The mantle is responsible for the movement of tectonic plates and is the source of magma that erupts from volcanoes.

* The outer core: The outer core is the layer of the Earth located between the mantle and the inner core. The outer core is composed of liquid iron and nickel and is approximately 2,400 km thick. The outer core is responsible for the Earth's magnetic field.

* The inner core: The inner core is the innermost layer of the Earth and is composed of solid iron and nickel. The inner core is approximately 1,200 km thick and is the hottest part of the Earth, reaching temperatures of up to 5,700 °C. The inner core is responsible for the Earth's rotation.