Curated OER
Geologic Time: Relative and Absolute Dating
High schoolers investigate relative and absolute dating; determine the difference between the two dating systems; and apply this knowledge by creating a geologic timetable of their own.
American Institute of Biological Sciences
Action Bioscience: Accuracy of Fossils and Dating Methods
Discover the accuracy of dating methods and fossils because of the scientific approach used.
Extreme Science
Extreme Science: How Old Is the Earth?
We say Earth is 4.6 billion years old, but how do we know? How do we measure its age? This article focuses on these questions and how long life has been on Earth.