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

Fact 2: For sedimentary rock, fossils provide the relative age of deposition.

Given the two facts above, answer the question "radioactive dating is used to determine the relative age of what?" with the following options: 
- discovery
 - ageless
 - rocks
 - blastoids
 - departation
 - deposition
 - sea urchins
 - bones


 

      deposition   