New Generation IV nuclear plants such as the pebble-bed nuclear reactor features
A) a combination of nuclear fusion and fission in a single design.
B) cooling with liquid helium, smaller scale and less nuclear fuel in the reaction chamber.
C) a design that uses a mechanical source of X-rays for power.
D) designs based on the Fukushima Daiichi plant in Japan.
B
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Which of the following is false?
A. Habitat islands can be wildlife preserves set aside to sustain endangered species. B. Habitat islands are isolated fragments of wildlife habitats. C. Habitat islands often cannot support the number of individuals required to sustain a population. D. Habitat islands may be national parks, protected areas, or freshwater lakes. E. Habitat islands are often surrounded by industrial areas.
Which experience was the most important in causing Darwin to begin to think about evolution and the history of life?
A. meeting Jean Baptiste Lamarck B. working as a naturalist on the H.M.S. Beagle C. studying the gradual erosion of canyons D. watching a debate between Charles Lyell and Thomas Malthus
Why are maritime air masses from the north Atlantic of only limited concern for weather in the U.S.?
A) They never cause severe storms. B) Polar fronts block these air masses from the U.S. C) Temperatures are usually mild over this region. D) Question is incorrect; these air masses are very important. E) Prevailing winds move them away from the U.S.
There has been some success demonstrated in controlling lava flows by using ____
a. ?water to harden the leading edge of the flow b. ?bulldozed trenches for the lava flow to follow c. ?high explosives to disperse the lava over a wide area to cool d. ?levees of older lava to funnel the flow into a valley e. ?aerial bombing of the volcano caldera