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55. An aquifer that is separated by impermeable rock is called a(n) _____ aquifer  

74. Fishing pressures (overexploitation) have eliminated _____% of top trophic-level predators in the oceans.  

56. What happens when the water table drops below sea level in aquifers near the ocean?  

71. What effect do acidic ocean waters have on shells made of calcium carbonate?  

Part 3, Bonus question, 5 points added to your Part 1+Part 2 score; answer the bonus question in the text box. The IPAT Model.  Give the equation for the IPAT model, define I, P, A, and T .  

66. The Mississippi River watershed includes land area from:  

30. Today, if we were to purchase a good or service at its true cost, how would the price compare with what we are accustomed to paying for the good or service?  

67. What was the dramatic event that helped spur passage of the 1972 Clean Water Act?  

40. Which was the first environmental law that required the U.S. government to consider environmental issues before approving policies?  

73. Where would you find the HIGHEST concentration of coral reefs?