The Earth's History

We all live on a blue planet called earth. Earth is just one of the nine planets in our solar system.
The earth was created about 7.5 billion years ago. It was created when a large amount of gas and rocks collided, to form the earth. The first sign of of life on earth was about 700 million years ago, these living organisms were small bacteria. Later, there were worms, jellyfish, and other animals, that did not have bones.

The so called "Big Bang," the moment when our solar system was formed.Here is the order some scientists think it happened in.

a. A cloud of gas called the nebula swirled in space.	b. Sections of the nebula began to spinn, looking like whirl pools.
c. Gas and dust collected at the centers of those whirlpools.	d. The collections of dust and gas form the Sun, and the other nine planets.

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