Study Questions 2-1 2007

Study Questions 2-1 2007 - Biology 370 Study Questions 2-1...

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Biology 370 Study Questions 2-1 1. Why is igneous rock, which does not bear fossils, required to determine the age of most fossils? 2. How does continental drift occur? How does continental drift produce mountain ranges on continents? 3. If a sample of igneous rock has twice as much 40 Ar as 40 K, how old is the rock? Use 1.3 * 10 9 years as the half-life of 40 K and assume that only 11.2% of the 40 K decays to 40 Ar. 4. If a sample of igneous rock has three times as much 40 Ar as 40 K, how old is the rock? Use 1.3 * 10 9 years as the half-life of 40 K and assume that only 11.2% of the 40 K decays to 40 Ar. 5. If a sample of igneous rock is 2 billion years old and has 2 x 10 -6 g of 40 Ar in it, how much 40 K did it have in it when it was formed? 6. If a sample of igneous rock is 3 billion years old and has 2 x 10 -6 g of 40 K in it, how much 40 Ar should it have in it now. 7. Carbon-14 has a half-life of 5700 years. In living things the ratio of 14 C to 12 C is 1.3*10 -12 . If you found a wooly mammoth frozen in ice, analyzed a sample of its fur and found that the ratio of
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Study Questions 2-1 2007 - Biology 370 Study Questions 2-1...

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