What is the most visible manifestation of eutrophication?
a. Hypoxia
b. Decomposition
c. Nitrogen fixation
d. Plankton bloom
ANS: D
Red tides, yellow foams, and green slimes are often found in areas of eutrophication. These blooms are
usually dominated by a single species. Information can be found in the section Marine Pollutants May
Be Natural or Human Generated.
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Which language has the greatest number of speakers?
A) English B) Spanish C) Arabic D) Mandarin
Horse latitudes at sea correspond to ____ on land
A) tropical rainforests B) great deserts C) glaciers D) mountain ranges
Since the 1970s, the overall trend in emissions of primary pollutants in the United States has ____
A) increased B) varied C) remained the same D) declined
Which one of the following processes is NOT one of the steps in the lifecycle of a midlatitude cyclone?
A. A disturbance develops along the polar front as cold and warm air masses converge B. Two warm or hot air masses converge resulting in convergent lifting C. Counterclockwise flow, in the northern hemisphere, pulls moist air into a low pressure center D. An occluded front, along which cold air uplifts warmer air