Which of the following isotopes can be used by geologists to date rocks?

Question

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U-238 is the best choice for dating rocks as it has a half-life of 4.5 billion years and is present in most rocks in small quantities. This allows geologists to determine the age of rocks using a variety of dating methods such as uranium-lead dating or potassium-argon dating. C-14 is not useful for dating rocks, but for dating organic materials like fossils up to around 50,000 years old. I-131 and Sr-90 are not commonly used for dating rocks but are more commonly used in medical applications such as thyroid treatment and radiation therapy.

Which of the Following Isotopes Can Be Used by Geologists