Geologists do not typically use carbon dating to determine the age of rocks because rocks do not contain carbon. Carbon dating is only useful for determining the age of once-living organisms, such as fossils or remains of plants and animals.

However, geologists can use other radiometric dating methods to determine the age of rocks, such as uranium-lead dating or potassium-argon dating. These methods rely on the decay of radioactive isotopes in the rocks to determine their age.

Uranium-lead dating is used to determine the age of rocks that contain uranium minerals. Uranium atoms decay into lead atoms at a known rate, and by measuring the ratio of uranium to lead in a rock sample, geologists can calculate the age of the rock.

Potassium-argon dating is used to determine the age of volcanic rocks, which contain potassium-bearing minerals. Potassium atoms decay into argon atoms at a known rate, and by measuring the ratio of potassium to argon in a rock sample, geologists can calculate the age of the rock.

Both of these methods are based on the principle of radioactive decay, which is the process by which unstable isotopes decay into more stable isotopes over time. By measuring the amount of parent and daughter isotopes in a rock sample, geologists can determine its age.