Fact 1: Radioactive dating is used to determine the age of fossils.

Fact 2: Dinosaurs are the most popular fossils.

Given the two facts above, answer the question "How can we figure out how long a dinosaur has been dead?" with the following options: 
- Measure the depth it was found
 - A set number of times
 - It remains dormant
 - Radioactive dating
 - Test the soil it was found in
 - Compare it to other dinosaurs
 - focusing a lens
 - Continents drifting


 

    Radioactive dating     