Nitrate in groundwater can be increased by infiltration of runoff from all of the following except
A. fields treated with synthetic fertilizers containing nitrogen.
B. glacial melt.
C. manure from cattle feedlots.
D. sewage-treatment waste water.
Answer: B
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Which of the following are affected by the loss of ozone?
A) crop yields B) phytoplankton populations C) immune systems D) eye tissues E) crop yields, phytoplankton populations, immune systems, and eye tissues
The world's desert regions _____
a. have always had arid climates b. are 99 percent covered by active sand dunes c. are fragile environments d. have no vegetation e. have no topographic relief
Which of the following statements regarding water density is correct?
A) Adding dissolved substances increases the temperature of maximum density for water because the formation of less-dense ice crystals is suppressed. B) Increasing the pressure decreases the temperature of maximum density for freshwater because the formation of bulky ice crystals is inhibited. C) Decreasing amounts of dissolved substances inhibits the formation of hydrogen bonds, which restricts the number of ice crystals that can form. D) Decreasing pressure increases the number of water molecules in a given volume and inhibits the number of ice crystals that can be created.
Which nation hosted the World Cup in 2010, becoming the first African nation do to so?
A) Somalia B) South Africa C) Nigeria D) Kenya E) Ghana