which unstable element is used to determine the age of volcanic rock?\nargon\ncarbon - 12\npotassium\ncarbon…

which unstable element is used to determine the age of volcanic rock?\nargon\ncarbon - 12\npotassium\ncarbon - 14

which unstable element is used to determine the age of volcanic rock?\nargon\ncarbon - 12\npotassium\ncarbon - 14

Answer

Answer:

C. potassium

Brief Explanations:

Potassium - argon dating is used for volcanic rocks. Potassium - 40 is an unstable isotope that decays to argon - 40 over time. Carbon - 12 is stable. Carbon - 14 is mainly used for dating organic materials.