# How Old Is The Earth? (UMAP)

### Author: Paul J. Campbell

For a translation of UMAP module #719 into Portuguese see product #99719 Translation.

This module provides the calculus underpinnings for the isochron diagram method learned by geology students in connection with rubidium-strontium and uranium-thorium dating, as well as for carbon-14 dating. Examples and exercises include calculating the ages of the earth, the moon, early human and animal skeletons in the Americas, and a Wisconsin Indian mound.** Table of Contents:CONTROVERSY OVER THE AGE OF THE EARTHTHE RELEVANT PHYSICSISOTOPES IN GEOLOGICAL DATINGA MATHEMATICAL MODEL OF RADIOACTIVE DECAYSOLVING A SIMPLE VERSION OF THE DATING PROBLEMTHE ISOCHRON DIAGRAMURANIUM-THORIUM DATINGLIMITATIONS OF THE DATING PROCESSHOW OLD IS THE EARTH? AND WHAT ABOUT THE MOON?APPENDIX: CARBON-14 DATINGAPPENDIX: OTHER USES OF ISOTOPE RATIOS10. SOLUTIONS TO THE EXERCISESREFERENCESACKNOWLEDGMENTSABOUT THE AUTHOR**

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