Radiometric dating webquest

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Geologists use radiometric dating to estimate how long ago rocks formed, and to infer the ages of fossils contained within those rocks. Radioactive elements decay The universe is full of naturally occurring radioactive elements. Radioactive atoms are inherently unstable; over time, radioactive "parent atoms" decay into stable "daughter atoms. When molten rock cools, forming what are called igneous rocks, radioactive atoms are trapped inside. Afterwards, they decay at a predictable rate. By measuring the quantity of unstable atoms left in a rock and comparing it to the quantity of stable daughter atoms in the rock, scientists can estimate the amount of time that has passed since that rock formed.
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geologic time scale webquest

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WebQuest: Earth\'s History

In Assignment 3, we began exploring the age of the Earth. You worked in small groups and as a class to complete the "If Scientists Think. Through presentation and discussion of individual ideas, the class reached agreements as to the best way to complete each of the prompts. 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. 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! Because this assignment is linked with your work in Assignment 3, you will have "If Scientists Think.
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Geologic Time

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Starting with the history of life on earth this webquest and class work and evolution to classification and the animal kingdom, we will find what really makes this world of ours tick. You will be given extra credit for vocabulary definitions. Questions: 1. When did life originate? Click here and follow the story.
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