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The theorized start of the universe is known as the Big Bang, which occurred 13.8 billion years ago. The universe began as a tiny, dense, fireball that exploded, tremendous amounts of energy was related within the process.

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4.54 million years ago, approximately one-third the age of the universe, Earth was formed by accretion from the solar nebula.

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The time before a record of life; it began with the formation of the planet and ended 4.0 billion years ago.

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The Archean eon began roughly 4 million years ago along with the formation of the Earth's crust, minor beginnings of life.

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Photosynthetic organisms appeared between 3.2 and 2.4 billion years ago and began enriching the atmosphere with oxygen, causing a chain reaction of life forms.

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The Proterozoic eon extended from 2.5 billion to 541 million years ago, with beginnings of life and the earliest evolutions.

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The Paleoproterozoic eon occurred 2.5 billion to 1.6 billion years ago with the appearance of anthropods, fishes, and the first life on land.

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The Mesoproterozoic eon occurred 1.6 billion to 1 billion years ago which spanned the rise, reign, and climactic extinction of the non-avian dinosaurs.

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1-1.15 billion years ago the as it 'froze' from the surrounding molten iron outer core.

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The Neoproterozoic era that occurred 1 billion to 541 million years ago was a time of transition between the ancient microbial world and the rise of large, complex animal life of the Phanerozoic.

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The Cambrian Explosion that occurred 541 million years came along with the sudden diversification of life forms and the unparalleled emergence of organisms. The event was characterized by the appearance of many of the major phyla (biological phyla) (between 20 and 35) that make up modern animal life.

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The Cenozoic eon has lasted from about 65 million years ago to the present day. It has seen the rapid evolution and rise to dominance of mammals, birds, and flowering plants.

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Recognizable humans emerged at most 2 million years ago in Africa.