Potassium-40 can be used to date ________ that are ________ old.
A)fossils; thousands of years
B)volcanic rocks and associated fossils; hundreds of millions of years
C)potassium-rich fossils; millions of years
D)carbon-containing materials; up to 75,000 years

Question

Quizplus · Accepted Answer

Potassium-40 is a radioactive isotope that has a half-life of 1.25 billion years. It can be used to date rocks that are hundreds of millions of years old, such as volcanic rocks, and associated fossils. This method is known as potassium-argon dating. The other options are not accurate as they do not correspond with the age range that can be determined using potassium-40 dating.

Potassium-40 Can Be Used to Date ________ That Are ________

Potassium-40 Can Be Used to Date That Are