The earth is a part of the solar system. It is the third planet away from the sun. The Earth was formed approximately 4.54 billion years ago and is the only known planet to support life. Scientists can then divides the Earth into layers from the surface of the Earth up to a floor have larger class 3 as follows: Lithosphere (Crust) is the outermost layer has a thickness of between 6-35 kilometers can be divided into two parts by the thickness of the crust, called Upper crust. Contains potassium and calcium aluminum silicate majority. For the most part, some call the lower crust. Higher density on the Consisting of magnesium, iron and calcium silicate majority. Asthenosphere (Mantle) is a layer between the crust and core. The interior is composed of magnesium and iron are the most common. Almost all solid mantle. In this class, there are some molten rock. Core is the innermost layer of the Earth, which has a very dense metal alloy composed of iron and nickel. Can be divided into 2 floors, is the Out core layer is a layer of liquid hot, and Inner core is in the center of the world. This section contains a solid state.