__________ in the African Transition Zone continues, as natural conditions and human activity place pressure on the region through overgrazing and the lack of precipitation.
Fill in the blank(s) with the appropriate word(s).
Desertification
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Which of the following are advantages of animal feedlots?
A. increased meat production, higher profits, and reduced soil erosion B. higher profits, less overcrowding, and reduced overgrazing C. reduced overgrazing, greenhouse gas emissions, and higher profits D. increased genetic resistance in humans, increased meat production, and higher profits E. reduced soil erosion, less overcrowding, and increased genetic resistance in humans
Extracting oil from shale deposits ________
A) has been occurring in the Canadian tar sands B) has been initiated on a large scale in the United States and will soon surpass Canada's production C) is energy inefficient because it involves heating rocks to extract the oil D) in the United States will take place mostly in northeast states as well as in Georgia and Florida
Why is productivity low in tropical regions?
A) because the deep waters are too warm to maintain a healthy biomass B) because the thermocline acts as a barrier to the mixing of surface and deep waters C) because there is too much sunlight D) because the low density of the water makes it hard for plankton to float near the surface E) All of the above are problems.
Smoke emitted into a stable atmosphere tends to spread horizontally, rather than mix vertically
a. True b. False