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Contents of Why study the ages of rocks?

• 7.1 How do you determine the order of events?
• 7.2 How are geologic events placed in relative order?
• 7.3 How do geologists determine the relative ages of rocks in widely separated places?
• 7.4 How was the geologic time scale constructed?
• 7.5 How do you recognize gaps in the rock record?
• 7.6 How have scientists determined the age of Earth?
• 7.7 How is the absolute age of a rock determined?
• 7.8 How do we know ... how to determine half-lives and decay rates?
• 7.9 How do you reconstruct geologic history with rocks?

Why study the ages of rocks?