Which of these ideas did you include in your answer? Check all that apply.
A
Relative dating uses the law of superposition, the principle of cross-cutting relationships, and index fossils to determine the relative ages of rock layers.
B
Absolute dating uses tools like a mass spectrometer and natural phenomenon like radioactive decay to determine the ages of rock layers.
C
Information from rock layers give clues about what was happening on Earth and what organisms lived at the time the rock layers were formed.