Multiple choice

The age of the Earth has been estimated to be about

  1. 3.75 billion years

  2. 4.25 billion years

  3. 4.54 billion years

  4. 4 billion years
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The age of Earth is estimated to be approximately 4.54 billion years (with an error margin of about 1%), based on radiometric dating of meteorites and Earth's oldest rocks. This method measures the decay of radioactive isotopes like uranium-238 into lead-206. The oldest terrestrial minerals (zircons) are about 4.4 billion years old, consistent with this age.

Keep practicing — related questions