Radioactivity in geologic dating

In Assignment 3, we began exploring the age of the Earth. Through presentation and discussion of individual ideas, the class reached agreements as to the best way to complete each of the prompts.You worked in small groups and as a class to complete the "If Scientists Think. Today's assignment will allow you to compare and contrast your ideas to some of the actual methods scientists used to develop an estimation of the age of the Earth.Over time, carbon-14 decays radioactively and turns into nitrogen.A living organism takes in both carbon-12 and carbon-14 from the environment in the same relative proportion that they existed naturally.To obtain further practice with the concepts of Steno's laws and geologic dating, work through the Understanding Geological Time section of this assignment.This portion of the assignment is an interactive web site that allows you to apply what you have learned and to learn more about how scientists tell time with geology.

The site ends with a short quiz - you should get a perfect score if you understand Web Assisgnment 4.

Scientists have developed technology that can accurately date rocks using radioactive materials which are fixed into the rocks as they form from sediments.

This dating technique is known as radiometric dating.

This is a relatively long activity so stay focused on your work.

Let your TA or Professor see your Certificate of Completion once you reach that screen at the end of the activity.

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