6. The age of the Earth can be estimated in many ways. Which statement below is most accurate (remember that uniformitarian calculations involve looking at the thickness and type of sedimentary rocks, and similar things, but do NOT include radiometric dating or counting of annual layers)?A) Uniformitarian calculations show that the Earth is about 100 million years old.B) Uniformitarian calculations show that the Earth is more than about 100 million years old, C) Uniformitarian calculations show that the Earth is more than about 100 million years old, D) Uniformitarian calculations show that the Earth is more than about 1 billion years old.E) Uniformitarian calculations show that the Earth is 4.6 billion years old.and radiometric techniques tell us how much older.and we have no way to estimate how much older.Points Earned: 1.0/1.0 Correct Answer(s):B

7. You are dating a lava flow by the potassium-argon system. However, the offspring in this system are leaking out of the minerals. Which is accurate?your error.detect your error.error by comparing concentrations of offspring from the edges and centers of grains.the error by comparing concentrations of offspring from the edges and centers of grains.8. You start with 800 parent atoms of a particular radioactive type, which decays to give stable offspring. You wait just long enough for two half lives to pass. You should expect to have how many parent atoms remaining (on average):to avoid statistical fluctuations, but the question says “on average”, so we asked you about 800 rather than 800,000,000,000,000 to make the math easier.)Points Earned: 1.0/1.0 Correct Answer(s):B

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- Fall '08
- ALLEY,RICHARDBANANDAKRISHNAN,SR
- Geology