The Evolution of the EarthScientists are still debating about how our Earth was formed. Most scientistsare of the view that Earth began to form around four and a half billion years ago.The Earth has reached its present form through several phases. It began as a ball ofswirling dust and clouds, and passed through a molten stage. At that time, the Earthwas very hot and was constantly bombarded by massive rocks and other materialsfrom the space. In this way, the size of the Earth grew. The Earth was so hot that itwas molten (in hot liquid form). If you boil a thick soup containing many substances,you may observe that the heavier particles tend to go to the bottom and lighterparticles come to the top. These lighter particles cool at the top and form a layerof crust (like the cream of milk). Similarly, while heavier substances formed thepart of the molten core, lighter substances rose to the surface and cooled. Slowly,an upper crust of lighter and cooler materials formed covering the molten interior.As the Earth's interior continued to cool, it contracted and the outer crustwrinkled, forming ridges (mountains) and basins (low areas which became oceanslater).The atmosphere of the Earth consisted of different kinds of gases including​