History of earth

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Based on the available evidence, scientists have been able to reconstruct detailed information about the planet's past. Earth is believed to have formed around 4.55×109 years ago out of the solar nebula, along with the Sun and other planets. The moon formed soon afterwards. Initially molten, the outer layer of the planet cooled, resulting in the solid crust.

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 Outgassing and volcanic activity produced the primordial atmosphere; condensing water vapor, augmented by ice delivered by comets, produced the oceans. The highly energetic chemistry is believed to have produced a self-replicating molecule around 4×109 years ago, and half a billion years later, the last common ancestor of all life lived. The development of photosynthesis allowed the sun's energy to be harvested directly; the resultant oxygen accumulated in the atmosphere and gave rise to the ozone layer. The incorporation of smaller cells within larger ones resulted in the development of complex cells called eukaryotes. Cells within colonies became increasingly specialized, resulting in true multicellular organisms. With the ozone layer absorbing harmful ultraviolet radiation, life colonized the surface of Earth.

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Over hundreds of millions of years, continents formed and broke up as the surface of Earth continually reshaped itself. Since the Cambrian explosion, about 535 million years ago, there were 5 distinct mass extinctions. The last one occurred 65 million years ago, when a meteorite collision probably triggered the extinction of the (non-avian) dinosaurs and other large reptiles, but spared small animals such as mammals, which then resembled shrews.

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Over the last 65 million years, mammalian life diversified, and several million years ago, a small African ape gained the ability to stand upright. As brain size increased, these hominids developed the use of tools and language. The development of agriculture, and then civilization allowed humans to affect the Earth in a short timespan like no other life form had before, affecting both the nature and quantity of other life forms as well as global climate.

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