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The discovery of radioactivity and its application to dating rocks is perhaps one of the greatest scientific achievements affecting the Earth Sciences.With the discovery of radioactive isotopes more then one hundred years ago, scientists quickly realized that the radioactive decay of materials found in rocks could be used to date the rocks and consequently change the "relative" geologic time scale into an "absolute" time scale.

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Read the pages listed below, which are available online through Library Reserves.

Electronic course reserves, or "e-Reserves," are articles and book chapters that are available online through the University Libraries.

Access this lesson's reading by clicking on the Resources tab in ANGEL, then clicking on the "Library Reserves" link. 94-95, "Postlab Problem." Record all of your work in a word processing document.

When you have completed this activity, you will be asked to submit your answers electronically by copying and pasting your answers into an online submission form included in the Lesson 8 folder in ANGEL.

If you have any questions about the lesson materials or assignments, post them to our online discussion forum (not e-mail). While you are there, feel free to post your own responses if you, too, are able to help out a classmate!

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