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About 4600 million years ago the earth is formed by gas and clouds of dust.
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At around 3800 million years ago the first signs of life appeared on earth. Life was mostly single celled organisms such as bacteria.
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Oxygen was first produced as early as 3500 million years ago but started to build up in the atmosphere around 2400 million years ago.
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The first eukaryotic cells appeared between 2100 and 1500 million years ago.
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The first multicellular life appears on earth around 600 million years ago.
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The mass extinction happened aproximately 434 million years ago. It wiped out 60% wildlife which was mostly sea life.
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This mass extinction caused reef extinction and the death of 75% of all species.
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Pangaea was a "super continent" that was made up of all the present day continents. It formed around 270 million years ago.
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This mass extincton happened 251 million years ago. 90-96% of all marine life were killed. It is also reffered to as "The Great Dying".
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This mass extinction happend roughly 205 million years ago. It wiped out 1/2 of marine invertebrates and 80% of land quadrupeds.
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Pangaea breaks apart as a result of continental drift to later form the current day continents.
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This extinction happened 65 million years ago and killed all the dinosaurs and most tropical marine life.
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Early ancestors of humans apeared around 7 million years ago, but Homo sapiens appeared between two hundred and one hundred thousand years ago.
