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Chapter 5: Weathering and Soil

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Expanding Your Knowledge

Chapter 5: Weathering and Soil

  1. Which mineral weathers faster-hornblende or muscovite? Why? Consider Bowen's Reaction Series in your answer.


  2. Compare and contrast the weathering rate and weathering products for Ca-rich plagioclase in the following localities
    1. central Pennsylvania with 40 inches of rain per year;
    2. Death Valley with 2 inches of rain per year;
    3. an Alaskan mountaintop where water is frozen year-round.



  3. The amount of carbon dioxide gas has been increasing in the atmosphere for the past 40 years as a result of the burning of fossil fuels. What effect will the increase in CO2 have on the rate of chemical weathering? The increase in CO2 may cause global warming in the future. What effect would a warmer climate have on the rate of chemical weathering? Give the reasons for your answers.


  4. In a humid climate, is a soil formed from granite the same as one formed from gabbro? Discuss the similarities and possible differences with particular regard to mineral content and soil color.

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