Question

which stable element is used to determine the age of volcanic rock? argon carbon - 14 potassium carbon - 12

Explanation:

Potassium - argon dating is a common method for dating volcanic rocks. Potassium - 40 decays to argon - 40 over time. By measuring the ratio of argon - 40 to potassium - 40 in a volcanic rock sample, the age of the rock can be determined. Carbon - 12 is a stable isotope but not used for dating volcanic rocks. Carbon - 14 is used for dating organic materials, not volcanic rocks.

Answer:

argon