Earth is made from recycled material. A long time ago, a large star exploded into a cloud of dust and gas. This explosion produced many of the important heavy substances that we find on Earth, such as iron, nickel and uranium. This kind of an explosion is also known as a supernova. 


The birth of the Solar System.

In time, the loose material condensed into larger and larger bodies, forming the Sun and the planets of our solar system. The image above shows the birth of our solar system.

All planets of the solar system, including Earth, orbit around the Sun in the same direction and on the same relative plane. 

When the Earth was young, it consisted of molten materials. The heaviest substances, such as iron and nickel, sank into the inner core of the planet, whereas the lighter substances remained near the surface. 

This resulted in the formation of the planet's layers.

Currently, we do not know how Earth got its water.