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Chapter 9, Problem 3QP

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If we pushed the Earth closer to the Sun, it would develop a thick, CO2-rich atmosphere like Venus. All of that CO2 would come from the Earth's a. sea floor after the oceans evaporate b. mantle after the crust melts c. volcanic eruptions which would become more frequent d. polar regions after the ice caps melt

4. An important question to consider when thinking about global warming is, "If the ice sheets near the poles melt, how much will the sea level rise?" This seems like a difficult question, given the odd shapes of both the ice sheets and the oceans. But there are some accurate approximations that allow the answer to be estimated fairly accurately with reasonably simple calculations. The crucial idea is that both the thickness of the ice sheets and the amount of sea level rise are extremely small compared to the radius of the Earth. The radius of the Earth is about 6 × 106 m-more than 6000 miles; by comparison, the ice sheet thicknesses we'll be concerned with are single-digit miles, and the sea level rises will be in dozens of feet. As a result, we can essentially ignore the curvature of the Earth when answering this question. We can imagine peeling the map of the earth off a globe and flattening it out (by making cuts, not by stretching so that we preserve the area). Then, both the ice…

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