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  • This is earth.Nearly all branches of natural science have contributed to the understanding of the main events of the Earth's past. The age of Earth is approximately one-third of the age of the universe.
  • The Earth is our home world. Before the Earth existed, there were no people. This means that there was no one around to witness its creation.
  • At least not any humans. However, scientists, like geographers, are able to make educated guesses about how the Earth came to be. These guesses are called theories. A theory is a guess based on evidence. These guesses are made by scientists who study clues to understand new things about the world and universe around us.
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