3. Why should it be considered unusual to find excessive amounts of helium in crustal rocks, according to Chapter 4 of DeYoung (2006)? What is one possible explanation for it? 4. According to Chapter 5 of DeYoung (2006), a radiohalo is a circular ring of damage caused by the decay from one alpha particle from each uranium atom that decays. How many alpha particles are required to make one halo, and why is this important? 5. Describe the level of agreement when several independent dating methods are applied to the same rock, in this case from the “Bass Rapids diabase” in Grand Canyon, according to Chapter 7 of DeYoung (2006)? Give the maximum spread of age-dates. 6. After considering the closing remarks from chapter 11 of DeYoung (2006), what is your response to schoolchildren of young ages being taught that the earth’s age has been scientifically measured at billions of years? 7. According to Nevins (1973), at the rate rivers are delivering sediment to the oceans today, how thick should the sediment layer be on the seafloor assuming the ocean basins are 1 billion years old?
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