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Understanding Geologic Time: Focus Questions Name:_________________ Class:_________________ Directions: Navigate to the site http://www.ucmp.berkeley.edu/education/explorations/tours/geotime/ind ex.html Answer the following questions as you navigate through Understanding Geologic Time. 1. How is relative age different from the actual date of an event? 2. What can radiometric dating tell us about the age of rocks that the Law of Superposition cannot? 3. How can you find the age of a layer of rock that is surrounded by layers of volcanic ash? 4. What do the periods in the geologic time scale represent? 5. What do the terms Paleozoic, Mesozoic and Cenozoic mean? Directions: Navigate to the site http://www.quia.com/pages/tigerbiology.html Please watch the videos entitled Cambrian Explosion Part 1 and Cambrian Explosion Part 2. 6. Why is the Cambrian Explosion referred to as Life’s Big Bang? 7. What effect do the discoveries of the Chengjiang China, have on Darwin’s branching tree of life? 8. How do some evolutionary biologists explain how there could be a very rapid explosion of new body plans at the beginning of the Cambrian period?
