Why was the irrigation of Soviet cotton farming operations a problem?
A) It was, for the most part, not a problem.
B) It drained the Aral Sea and increased the salt content of soils.
C) There was governmental opposition that limited water access, killing crops.
D) It angered local resort communities, which did not want farming in the region.
E) Irrigation water came from rivers feeding into one of the largest lakes on Earth and resulted in major contamination of that source.
B
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Which of the following would occur during a La Niña event?
A) Trade winds strengthen, causing the waters in the tropical eastern Pacific to become warmer than normal. B) Trade winds weaken, causing greater upwelling of cold water off the west coast of South America. C) Trade winds weaken, causing droughts in the United States and Southeast Asia. D) Trade winds strengthen, causing greater upwelling of cold water off the west coast of South America.
Which of the following is thought to have enriched ocean floor sediments with rare-earth elements?
A) Clathrate formation B) Deep-sea hotsprings C) Groundwater leaching D) Nodule and crust creation E) Sea floor methane seeps
Clouds do all of the following, except
A) reflect solar energy back to space. B) absorb solar energy. C) decrease the amount of solar radiation reaching Earth. D) decrease nighttime temperatures. E) emit longwave radiation toward Earth's surface.
Where does the length of day remain the same throughout the year?
A) at the Tropic of Cancer B) at the equator C) at the Tropic of Capricorn D) within 10 degrees of the North Pole E) within 10 degrees of the South Pole