4.6 billion years ago the earth was formed
4.4 billion years ago the oceans began
3.9 billion years ago the first life appeared
1.5 billion years ago oxygen became present
700 million years ago single celled animals evolved
530 million years ago fish started swimming
400 million years ago land plants began growing
350 million years ago land vertebrates came into being
225 million years ago dinosaurs roamed the earth
65 million years ago they became extinct
130,000 years ago humans evolved
It took 66 years to land on the moon after the first airplane flight

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