A meltdown of the reactor core would occur if
A. control rods were inserted into the core.
B. too much coolant was lost.
C. the proportion of uranium-238 was too high.
D. the containment building developed an air leak.
E. the containment shell was too thick.
Answer: B
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Pesticides kill only which of the following organisms?
A. Pesticides generally kill more than one type of organism B. Humans working around crops C. Fish in agricultural streams D. Pests of important cash crops
True or False: Geologists use a single tool to gather information about Earth
Indicate whether this statement is true or false.
Why don't diamonds turn back to graphite once they reach Earth's surface?
A) Diamonds are too hard to undergo reactions. B) Temperatures need to be lower than those found on Earth. C) There is not enough heat on the surface of the earth to drive the reverse reactions. D) Humans harvest diamonds before they can turn back to graphite.
Which of the following is least likely to reduce soil fertility?
A) weathering B) agricultural use and harvest C) a fallow period with no plant growth D) the dissolution of minerals