Since the formation of the Earth 4.6 billion years ago, much has happened. The fossil record is quite extensive, especially since the Cambrian explosion, showing a great diversity of life and adaptations over time. Explore the following websites and practice your scientific notation skills in writing out the years.Overview of the Time Periods:
http://www.physci.wsc.ma.edu/young/hgeol/geoinfo/geohistory.html#phanerozoic
More specific details since the Cambrian Explosion:
http://www.ucmp.berkeley.edu/cambrian/camb.html
Worksheet:
http://sites.google.com/a/lifescienceswahiawa.com/20092010/3rd-quarter-2009-2010/7-5-3-evolution/50TimelineoftheWorld.pdf
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