Radioactive Decay as a Measure of Age
Explains radioactive decay, including parent and daughter isotopes, and half lives, and its importance.
Earth Science
Evidence About Earth's Past
Understanding Geologic Time Lesson Plan
Community Contributed
Students take an informational tour to gain a basic understanding of geologic time, the evidence for events in Earth’s history, relative and absolute dating techniques, and the significance of the Geologic Time Scale.
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