The earth's interior consists of rock and metal. It is made up of four main layers:
| Inner Core | Solid, composed of Ni, K, and Si, and extremely dense |
| Outer Core | Liquid, rich in Iron and Nickel, and 6700 Degrees Celsius |
| Mantle | Solid, elastic, flows at a very slow rate, completes 82% of the earth’s composition, divided into Upper and Lower Mantle (see diagram), and composed of Silica-rich rocks |
| Crust | Made of brittle rock that can move easily and the average crust size is 20 km |
The Earth is warmed by an “internal engine,” which is created by radioactive decay of Uranium, Thorium, and Potassium.
The radius of the earth is 6370 km (3860 mi).
Oceanic crust can be up to 10 km (6 mi) thick.
The Outer Core is between 2900 and 5000 km (1800-3100 mi) deep.
The temperature increases rapidly up to 9000 F in the core, which is hotter than the sun's surface. Therefore, the intense heat from the inner core causes material in the molten outer core and mantle to move around. As a result, the large plates on the earth's crust slowly drift on the surface. It is also possible that these currents generate the earth's magnetic field, called the magnetosphere.