The Earth (Important Facts) {Part-15}

THE EARTH IS THE THIRD of the eight planets that orbit the Sun. It is the largest and densest rocky planet, and the only known to support life. About 70% of the Earth's surface is covered by

The Earth

water, which is not found in liquid from on the surface of any other planet. There are 4 main layers:-
(i).The Inner Core
(ii).The Outer Core
(iii). The Mantle
(iv). The Crust

At the heart of the planet the solid Inner Core has a temperature of about 6,600^oC. The heat from this Inner core causes material in the molten outer core and mantle to circulate in convection currents. It is thought that these convection currents generate the Earth's magnetic field, which extends into space as the Magnetosphere.

Magnetosphere

The Earth's atmosphere helps screen out some of the harmful radiation from the Sun, stops most meteoroids from reaching the planet's surface, and traps enough heat to prevent extremes of cold. The Earth has one natural Satellite, the Moon, which is thought to have formed when the huge asteroid impacted Earth in the distant past.

Formation Of Earth

Chemical composition of the Earth