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As you make your way through this chapter, you'll find out how fossils are used to indicate time and what two primary methods are used in geological dating. Instructors will lead you through lessons on fossil preservation and the geologic time scale. Other resources available to you include lesson transcripts and links to text lessons that provide more detailed information on critical vocabulary terms. The geologic time scale is an essential tool for understanding the history of Earth and the evolution of life. Radiometric dating is a method used to determine the age of rocks and other materials based on the rate of radioactive decay. Radiometric dating is used to estimate the age of rocks and other objects based on the fixed decay rate of radioactive isotopes.


Add important lessons to your Custom Course, track your progress, and achieve your study goals faster. You can learn about the Law of Superposition and the principles of original horizontality, along with the cross-cutting relationships principle.
You can impress your friends with your knowledge of the theories of catastrophism and uniformitarianism.
They create short, engaging video lessons that are easy to follow and provide all the information you need to know about this topic. We'll explore both relative and numerical dating on our quest to understand the process of geological dating. Learn about three common types of radioactive decay: alpha decay, beta decay and gamma decay.


Learn about half-life and how it is used in different dating methods, such as uranium-lead dating and radiocarbon dating, in this video lesson.
After you watch the video lessons, you can gauge your understanding of the subject matter with the self-assessment quizzes that accompany each lesson. Along the way, we'll learn how stratigraphic succession and radioactive decay contribute to the work of paleontologists.



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