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4.6 billion years ago - Formation of the Sun

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4.6 billion years ago - Formation of the Sun

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A supernova caused a nebula to pull together and become a spinning disk of dust called a solar nebula or protoplanetary disk. The energy and gravity at the center formed a star that we call the Sun.

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4.54 billion years ago - Formation of Earth

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4.54 billion years ago - Formation of Earth

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As dust swirled around the sun, planets started to form as a result of particles colliding and forming bigger and bigger masses (this process is called accretion).

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4.5 billion years ago - Formation of the Moon

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4.5 billion years ago - Formation of the Moon

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A protoplanet the size of Mars collided with Earth and broke into pieces, which came together to form the Moon.

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About 4.5 - 3.8 billion years ago - Heavy Bombardment

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About 4.5 - 3.8 billion years ago - Heavy Bombardment

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Many asteroids and comets slammed into Earth as a result of Jupiter's gravitational pull, and water from these asteroids and comets melted and formed water vapour.

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3.8 billion years ago - Planetary Cooling and Protocontinents

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3.8 billion years ago - Planetary Cooling and Protocontinents

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The Earth started to cool and water vapour condensed into the first oceans, although there were still many active volcanoes on Earth. As the planet started to cool, heavier elements started to sink towards Earth's center, creating Earth's layers and forming its first continents, called protocontinents.

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3.5 billion years ago - Emergence of Oxygen

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3.5 billion years ago - Emergence of Oxygen

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Oxygen on Earth started from biochemical rocks and bacteria due to the evolution of photosynthesis. This was the start of the oxygenation of Earth.

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3 billion years ago - Growth of Earth's Crust

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3 billion years ago - Growth of Earth's Crust

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As Earth started to cool down, it formed a thin crust. 70% of Earth's crust was formed by 3 billion years ago.

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2.4 billion years ago - Oxygen Spike and "Boring Billion"

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2.4 billion years ago - Oxygen Spike and "Boring Billion"

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After an oxygen spike, the Earth hardly changed for a billion years which scientists call the "Boring Billion."

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750 million years ago - The Snowball Earth

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750 million years ago - The Snowball Earth

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A supercontinent ripped apart, causing an ice age called the "Snowball Earth." The whole Earth cooled significantly, and glaciers covered a lot of it.

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650 million years ago, oxygen levels started rising again, and the first animals emerged.

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545 million years ago - The Cambrian Explosion

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545 million years ago - The Cambrian Explosion

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During the Cambrian Explosion, many different kind of animals emerged, and life on Earth increased significantly.

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252 million years ago - The Permian Period and Mass Extinction

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252 million years ago - The Permian Period and Mass Extinction

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During the Permian Period, in just 60,000 years more than 90% of life went extinct. This was the biggest mass extinction in the fossil record.

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66 million years ago - End of Cretaceous

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66 million years ago - End of Cretaceous

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At the end of the Cretaceous Period, all dinosaurs went extinct, more than 85% of life on Earth.

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2.6 million years ago - Start of Fifth Major Ice Age

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2.6 million years ago - Start of Fifth Major Ice Age

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The fifth major ice age began, and is still ongoing as of right now.

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200,000 years ago, the first humans emerged. Humans are the most intelligent life forms on Earth.

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How the Earth Formed

https://newsela.com/read/natgeo-formation-of-earth/id/2000002395/?collection_id=2000000192&search_id=c96f553b-2816-4f8d-8d39-7c6f5a209f48

https://thewire.in/science/a-brief-history-of-the-earth-how-it-all-began

https://signsofthelastdays.org/earths-crust-peeling-in-two-under-ocean-national-geographic/

https://www.bbvaopenmind.com/en/science/bioscience/what-were-the-first-animals-on-earth/

https://www.cbsnews.com/news/extinct-tree-climbing-human-walked-with-a-swagger/

https://science.time.com/2012/09/11/second-gunman-in-death-of-the-dinosaurs/

https://www.quora.com/What-did-Earth-look-like-3-billion-years-ago