HFCs and HCFCs are ____
A) the primary components of photochemical smog
B) replacements for CFCs
C) clean-burning fossil fuels
D) cancer-causing chemicals produced by automobiles
B
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In 1985, ________ produced a minor eruption that melted part of a glacier near its summit, sending a lahar down its slopes and killing at least 22,000 people.
A. Vesuvius, Italy, B. Nevado Del Ruiz, Colombia, C. Popocatepetyl, Mexico, D. Mt. Mayon, Philippines, E. Mont Pelée, Martinique,
Forecasting has greatly improved in terms of the Indian monsoon rains because ________
A) of supercomputer models B) of the installation of hundreds of rain measurement stations C) of cooperation among Indian government agencies D) monsoons are becoming less variable over space and time E) researchers have gotten rid of the idea that teleconnections affect the monsoon
Which of the following is NOT involved in turning some sediment into sedimentary rock?
A. metamorphism B. compaction C. cementation D. burial E. All of these are involved.
In a food chain, grass absorbs sunlight to make sugar, the grass is eaten by a rabbit, and the rabbit is eaten by a fox. What is a throughput that connects this system?
A. ATP B. energy C. sugar D. the will to survive