Which of the following most accurately describes the process by which a dead zone occurs?
A) Overharvesting and poor fishing techniques create areas devoid of life within the ocean.
B) Fertilizers and pesticides are carried from cities and farmland to the oceans, where these pollutants kill fish and other marine organisms, creating a zone devoid of life near shore.
C) Nutrient runoff leads to increased growth of aquatic algae and plants, which remove oxygen from water in order to photosynthesize. Fish and other marine organisms are thus robbed of the oxygen they need.
D) Increased nutrients lead to increased growth of algae and plants. When these organisms die, decomposers use oxygen in the water to break down the dead organisms. Fish and other marine organisms are thus robbed of the oxygen they need.
D
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Which region or country has benefited the least from the Green Revolution?
A) Africa B) India C) East Asia D) Latin America E) Mexico
Examples of major nation-states are
A) Germany and Denmark. B) Australia and New Zealand. C) Russia and the United States. D) Mexico and Russia. E) Mexico and Germany.
During the winter as you travel toward a warm front, the most likely sequence of weather you would experience is
a. ?snow, freezing rain, hail, and sleet. b. ?rain, snow, sleet, freezing and rain. c. ?freezing rain, snow, sleet, and rain. d. ?snow, sleet, freezing rain, and rain. e. ?hail, sleet, freezing rain, and snow.
The figure above shows an upper-level 500 mb weather map drawn over North America. What are the lines on this map called?
a. geopotential height contours b. elevation contours c. isotherms d. isobars