You are presented with the question "What do geologists use to determine the age of rock layers?" and the following answer choices: 
- Chemical dating
 - Mechanical dating
 - Non radioactive dating
 - blastoids
 - single-celled organisms
 - Seismometer
 - Radioactive dating
 - an electron microscope

Now knowing that radioactive dating is used to determine the age of fossils and geologists use fossils to determine the age of the rock layer that it was found in, choose the best answer.


 

       Radioactive dating  