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From this information, scientists can accurately infer the age of the test material.

Continue to the Radiometric Dating portion of this assignment through use of a virtual web site.

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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.

After all, it is possible that rock layers can be disturbed, overturned, and altered in both natural and unnatural ways.

Before then, the Bible had provided the only estimate for the age of the world: about 6,000 years, with Genesis as the history book.

Hutton's theories were short on evidence at first, but by 1830 most scientists concurred that Noah's ark was more allegory than reality as they documented geological layering.

Measuring the uranium-to-lead ratios in the oldest rocks on Earth gave scientists an estimated age of the planet of 4.6 billion years.

Segment from A Science Odyssey: "Origins."Geologists have calculated the age of Earth at 4.6 billion years.

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.

You will investigate Steno's Laws, radiometric dating, and then visit an interactive site that will help you better understand how to tell time - with geology! As you proceed through Assignment 4, be sure to compare your answers from "If Scientists Think. ." to the actual methods scientists use to estimate the age of prehistoric objects.

The web site is simple, especially at the begnining, yet allows you to visualize relationships among the main concepts you have been studying.

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

Who's to say that the rocks a particular scientist is studying have not been displaced from their original positions?

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