From a geological perspective, what is a major potential problem with safeguarding a high-level nuclear waste repository deep underground at Yucca Mountain?
A. The difficulty in keeping it dry for 10,000 years.
B. The challenge of protecting it from a meteorite impact.
C. Assuring that it will not be eroded away by rising oceans
D. The potential of harvesting by alien visitors.
Answer: A
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Which of the following statements most accurately describes the benefits of Bt corn?
A) Because it contains a certain gene removed from a soil bacterium, Bt corn is immune to the European corn borer. B) Bt corn is resistant to the pesticide Bt, so farmers growing Bt corn can use Bt on the weeds in their cornfields without it harming their crop. C) Bt corn produces increased yields because it is resistant to infection from the Bt virus that lives in agricultural soils. D) Although Bt corn has its benefits, the use of Bt corn runs the risk of pests becoming immune to its toxins.
Biomes are determined based on
A) evolutionary history and degree of isolation. B) dominant faunal assemblages. C) life zones. D) topographic and climatic variables. E) easily identifiable vegetation characteristics of the dominant plants.
A storm of tropical origin whose high winds and water cause a great deal of destruction to islands in the western North Pacific is (in this part of the world) known as a
a. ?hurricane. b. ?cyclone. c. ?willy willy. d. ?mesocyclone. e. ?typhoon.
The United States contains only 4.3% of the world's people, but produces approximately 25% of the world's solid waste.
Answer the following statement true (T) or false (F)