The absolute age of rocks and fossils refers to their actual age in years. This is determined through various dating methods such as radiometric dating, which relies on the decay of radioactive isotopes. By measuring the amount of parent and daughter isotopes in a sample, scientists can calculate the age of the rock or fossil. This provides a more accurate measure of the age compared to relative dating, which determines the age of rocks and fossils based on their relationships to other rocks and fossils.
