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About how old is Earth?

  • 4.5 Billion Years
  • 3.5 Billion Years
  • 2.5 Billion Years
  • 5.5 Billion Years
Explanation

The age of Earth is estimated to be around 4.5 billion years. This estimate is primarily based on radiometric dating of rocks and minerals found on Earth, as well as meteorites, which are thought to have formed around the same time as our planet. By analyzing the decay of radioactive isotopes within these materials, scientists can determine their ages and infer the approximate age of the Earth. Additionally, other dating methods and evidence from geology, astronomy, and the study of fossils also contribute to supporting this age estimate.