In this book Dr. Tas Walker July 31st, These cases are very specialized, and all are well understood. We know the Earth is much younger because of non-radiogenic indicators such as the sedimentation rate of the oceans. Homeschool Curriculum Weather and Storms:
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Part II. Well, scientists are able to answer all of these wondrous questions and more by use of a process called radiometric, or radioactive, dating. For example, most people don't realize that carbon dating is only rarely used on rocks. The half-life is reliable in dating artifacts because it's not affected by environmental or chemical factors; it does not change. It is another thing to understand what it means. The slope of the line is used to determine the age of the sample. This time machine does not allow people to actually go back in time, but it does allow scientists to observe ancient events from a long way away.