Question

Radioisotopes tell scientists that Earth is how old? A. 65 million years B. 500 million years C. 4.5 billion years D. 13.4 billion years

Answer 1

Radioisotopes tell scientist that Earth is 4.5 Billion years.

This is an energetic isotope of an element.

Answer 2

The correct answer is (C) 4.5 billion years

Radioisotopes can be defined as the isotopes made of radioactive atoms. They break continually till they form a material that is stable in atmosphere. By seeing how radioisotopes breakdown and the amount of radioactive materials found in the fossils, geologists can determine the age of rocks. Scientist discovered the oldest known rock whose age is determined 4.37 billion years old. This was determined using radioisotopes. The earth might be older than this but according to radioisotopes the age of earth is around 4.37 or 4.5 billion years old.