What compounds did the United States ban in the late 1970s for all nonessential uses?
In the late 1970s, the United States banned all nonessential uses of chlorofluorocarbons (CFCs), which were at the time widely used as propellants in spray cans.
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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.
If you were to put your hand out into the thermosphere, it would:
A) instantly burn up because of very high temperatures. B) gradually warm up above body temperature. C) freeze quickly because of the very cold temperatures. D) not feel any heat, because very few air molecules would collide with your skin.
The diffusion of HIV/AIDS prevention methods and treatments in the United States is an example of which type of diffusion?
A) contagious B) hierarchical C) relocation D) stimulus E) geospatial
Which of the following are problems of inner cities?
A) crisis housing B) inadequate funding of inner-city schools C) Health care in the inner city is poor. D) Crime rates in inner city areas are higher. E) all of the above