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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.

Following this introduction, there are several links to different sites concerning the methods scientists use to assist them in estimating the age of the Earth.

It would benefit your understanding of this material if you studied the rest of this website on your own, but it is not required for class.

Now that you have discovered the method that scientists originally used to date geological features, you may be questioning the accuracy of this dating method.

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.

Plastic bags are normally fine but it is best to use those designed for use with food as these are likely to have lower plasticiser levels, and to wrap the samples in them in aluminium foil.

For small samples, glass tubes with screw on tops are preferable - use aluminium foil under the lids to prevent the samples sticking to the lids, which are usually plastic.

If you have an incorrect answer be sure to figure out why that answer was wrong and what is the correct answer.

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

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