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| 15 billon years ago The big ban occured, and the galactic system was created. 5 billion years ago The solar system was created. 4.6 billion years ago The primitive earth was born, and the primitive atmosphere and the magma ocean was formed. 4.6`4 billion years ago The seas were made. 4 billion years ago The first organisms appeared. 2 billion years ago Organisms started to make oxygen. 400 million years ago The ozone layer was created, and it became able to live on land. 65 million years ago The dinosaurs became extinct. 2.5 million years ago The ice age began. 2 milion years ago Human beings appeared. |
