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Assume that you are one of the health professionals described above.

Play a game that tests your ability to match the percentage of the dating element that remains to the age of the object.

You are about to begin exploring the world of mental health. Please click on the word "worksheet" above to print out a copy of the assignment, if you need it. Based on what you've learned so far, and the information provided in these websites, write your own case study.

They not only identify types of rocks, but they also try to determine the rock’s age.

In the process of studying rocks, they often discover fossils embedded in them.

Long before geologists tried to quantify the age of the Earth they developed techniques to determine which geologic events preceded another, what are termed "relative age” relationships.

These techniques were first articulated by Nicolas Steno, a Dane living in the Medici court of Italy in the 17th C.

Not every answer will be on this page--some information you have learned in class. The subject of the case study can be a friend or a relative.

See the form on the worksheet for complete instructions.

In contrast, absolute dating uses radioactive decay and other information to date fossils to a particular age.

Both types of systems of dating provide valuable information about the history of and life on Earth.

Some methods are suited to particular rock types, while others to particular fossil types.