The earth is approximately __________ billion years old.

Name: The earth is approximately __________ billion years old.
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Scientists estimate that the earth is around 4.5 billion years old. This estimate is based on various scientific methods, including radiometric dating of rocks and analysis of the decay of radioactive isotopes. While some estimates have been higher (option D), most current research supports the 4.5 billion-year estimate.

The Earth Is Approximately __________ Billion Years Old