Q: Given a scientific passage and an answer, generate a question for the given answer.
Passage: Carbon-14 has a relatively short half-life. It decays quickly compared to some other unstable isotopes. So carbon-14 dating is useful for specimens younger than 50,000 years old. That's a blink of an eye in geologic time. But radiocarbon dating is very useful for more recent events. One important use of radiocarbon is early human sites. Carbon-14 dating is also limited to the remains of once-living things. To date rocks, scientists use other radioactive isotopes. Answer: half-life
A:
What property of carbon and other elements can be used to date fossils and rocks, among other things?