Aboslute & Relative Age 2

The relative age of a rock is...

How are half-lives used in Earth Science?

The time it takes for half of the radioactive atoms in a sample of radioactive element to decay is the element's...

How many half lives have passed when there are approximately 84,000 atoms of the daughter element?

The half-life of the parent element is 500 years. If a fossil is found with 50,000 atoms of the parent element remaining, how old is the fossil? Use the graph above to help you answer the question.