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At some point, asteroids or comets containing water ice slammed into the Earth, thereby bringing a lot of water vapor to the Earth.Once the Earth cooled, this vapour condensed and fell as rain on the planet.This series explores the geological and natural history of Earth, beginning with the formation of our Solar System, moving on through asteroid impacts and mass extinctions, and ending with the human impact on the environment today.To really grasp the magnitude of the changes our planet has undergone, we need to speed through immense timescales, pausing at important milestones.Geological time is primarily divided into eons, which are divided into eras, which are further divided into periods.A discussion of these three scales falls within the scope of this series.

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At this point, Earth was still cooling from the formation of the Moon, and the period of bombardment kept it agitated and volcanically active.The gas giants, Jupiter and Saturn, and the ice giants, Uranus and Neptune, formed much faster than the four terrestrial planets: Mercury, Venus, Earth, and Mars, did.Approximately 4.54 billion years ago, a Mars-sized body slammed into the newly formed Earth, partially liquifying the surface and ejecting molten debris into space.They record their own formation and grow over millions of years, keeping evidence of life and planet activity within.The field of geology that studies and dates rock layers is called Stratigraphy.

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