The Origin and Evolution of Earth When the solar system settled into its current layout about 4.5 billion years ago, Earth formed when gravity pulled swirling gas and dust in to become the third planet from the Sun. Earth has a central core, a rocky mantle, and a solid crust. (definition from NASA) The Earth is our home planet the third planet from the Sun, and the only planet we of so far that’s inhabited by living. The origin of the earth was a mystery for several years. Many scholars…
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