The reflection of sound is
A. a reverberation.
B. a rare occurrence.
C. an echo.
D. none of the above
Answer: C
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The most effective water heater is a(n)
A. gas water heater. B. electric water tank. C. roof-mounted solar hot water heater. D. oil water heater. E. propane water heater.
Which one of the following energy sources is most likely to lead to thermal pollution?
A) A coal-fired power plant B) A large field of windmills C) A hydroelectric plant D) A large field of solar cells
Which of the following statements is true regarding the relationship between air pressure and altitude?
A. as one moves lower in the atmosphere, pressure decreases, as one moves closer to the earth's surface, pressure increases B. as one moves up in the atmosphere, pressure decreases, as one moves closer to the earth's surface, pressure increases C. as one moves lower in the atmosphere, pressure decreases, as one moves closer to the earth's surface, pressure decreases D. as one moves up in the atmosphere, pressure increases, as one moves closer to the earth's surface, pressure increases
The term "ground water mining" refers to
A) the use of ground water to mine minerals. B) the removal of overlying rock to reach ground water. C) the removal of ground water at a rate faster than that at which it can be replaced. D) the excavation of tunnels to reach ground water.