Surface waves are useful for investigating Earth's interior because they
A. reflect at the boundaries between Earth's layers.
B. cast shadows indicating Earth's layers.
C. refract at the boundaries between Earth's layers.
D. none of the above
Answer: D
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The great environmental benefit of hydropower as an energy source is that it
A) produces few atmospheric pollutants. B) benefits water quality. C) has no impact on local plant and animal life. D) maintains the pristine quality of the body of water on which it is built. E) both that it benefits water quality and it has no impact on local plant and animal life.
If water had a lower specific heat capacity, would ponds and lakes be more likely or less likely to freeze in winter?
What will be an ideal response?
Which nation is currently phasing out nuclear power while, at the same time, pushing aggressive goals for renewable energy and greenhouse gas emissions?
A. France B. China C. India D. Germany E. Iceland
The ________ is a basic Système International (metric system) unit of mass
A) ton B) gram C) ampere D) mole E) meter