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Ch 4 check
Question | Answer |
---|---|
relative age | the age of an event or object in relation to other events or objects |
disturbed layers | igneous rocks from cooling magma can cut through sedimentary layers |
index fossils | offer clues about age of rock |
radioactive dating | radioactive materials break down at the same rate |
half-life | the rate of change of a radioactive element is measured in half-lives |