Nuclear fusion reactors would
A. require extremely rare elements as fuel, which is why none are currently in use.
B. produce more nuclear fuel for future use as they operate.
C. involve far fewer radiation hazards than fission reactors.
D. be very inexpensive to build, once the technology is perfected.
Answer: C
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Where do most of the rebellious ethnic groups of Burma (Myanmar) live?
A) just across the border in Thailand
B) in the port cities of Burma
C) in middle-sized municipalities
D) in frontier regions, far from the urban areas of the nation
E) in the capital city
Considering the Earth's annual energy balance, the Earth absorbs approximately 51 units of solar energy but emits 117 units of infrared energy. What prevents the Earth from getting colder and colder?
What will be an ideal response?
Which one of the following is an igneous rock?
A) limestone B) rhyolite C) slate D) quartz
Which statement about lakes is true?
A. Stratified layers of lakes are characterized by vertical mixing. B. Stratification increases levels of dissolved oxygen, especially in the bottom layer. C. Lakes are more vulnerable than streams to contamination by plant nutrients, and toxic substances. D. Lakes have more flushing than streams. E. Changing of water in lakes takes days to weeks.