Question

Scientists think the earth is approximately _____ years old.
2 billion
3 billion
4 ½ billion
6 ½ billion

Answer 1

scientist thinks the earth is approximately 4 1/2 years old.

Answer 2

Answer is 4 ½ billion.

Scientists think the earth's age is 4 ½ billion. This calculation is based on the radioactive dating. Since the formation of the earth, the time period has been divided into 3 major geological time periods as eon. They are phanerozoic, proterozoic and archean.