The planting of strips of trees and shrubs along the edges of plowed fields is used to
A) decrease wind erosion.
B) form water catchments for irrigation and wildlife conservation.
C) drain off excess water during heavy rainfall events.
D) limit the spread of crop pests.
A
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Until what year were the U.S. and Europe the leading producers of steel, accounting for 90% of output?
A) 1945 B) 1959 C) 1968 D) 1973 E) 1985
During the summer of 1783, the greatest lava eruption of historic times poured forth at ________, accompanied by the release of an enormous volume of gases that enshrouded much of northern Europe in a "dry fog" or blue haze rich in SO2 (one of the visible components of today's urban smog).
A. Mont Blanc, France B. Ararat, Turkey C. Laki, Iceland D. Vesuvius, Italy E. Stromboli, Italy
Why do tropical coral reefs prefer high wave energy locations?
a. They are hard enough to sustain themselves during the wave action. b. They receive less sunlight in these areas. c. They become the first to obtain dissolved gases and food particles. d. They need high levels of sunlight
The geography of production and trade has changed the global pattern of container ports. Which of the following are characteristic of these changes?
A) The world's largest ports are in Hong Kong and Singapore. B) The largest U.S. ports are on the east coast. C) New York City remains the highest U.S. port in trade volume. D) all of the above E) none of the above