Question

why is radioactive dating important when approximating the age of earth? scientists can identify different life forms using index fossil records. scientists can examine how temperature changes within earths interior. scientists can determine the order of when rocks formed on earth. scientists can analyze changes in chemical concentration of atmospheric gases.

Explanation:

Radioactive dating is used to determine the age of rocks. By measuring the decay of radioactive isotopes in rocks, scientists can figure out when the rocks formed, which helps in approximating Earth's age. The other options are not related to the core function of radioactive - dating for Earth - age approximation.

Answer:

Scientists can determine the order of when rocks formed on Earth.