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| 1. Use a search engine to explore the topic of isotopes and dating ancient rocks. How can isotopes be used to determine if rocks contain evidence of life?
2. Make a search for basic information on elements, using one or both of the following websites:
http://www.chemsoc.org/viselements/pages/data/intro_dblock.html http://www.webelements.com/webelements Click on the icons for C, H, N, O, P, and S. List the source, biological importance, and other useful information about these elements. |