Structure of the Earth

The structure of the Earth is divided into layers. These layers are both physically and chemically different. The earth is made up of Three layers. The crust, the mantle and the core.

1. The Crust– The crust is the outermost layer of the Earth. It is made of solid rocks. It is mostly made of the lighter elements silicon, oxygen, aluminium. Because of silicon and aluminium we called it sial. The thickness of the crust is about 30 km.
2. Mantle– The mantle is the layer of the Earth right below the crust. It is made mostly of Oxygen, silicon and magnesium. It is known as sima. The thickness is about 2900 Km.
3. Core– The innermost layer is the core with a radius of about 3500 km. It is mainly made up of nickel and iron and is called nife. The central core has very high temperature and pressure. The core is further divided into two parts outer core and inner core.
   1. Outer Core– It is a liquid layer below the mantle. The thickness is about 2200 Km
   2. Inner Core– It is the very center of the Earth. The thickness is about 1270 Km.