One of the major causes of desertification is
A. demand for fuelwood.
B. drought.
C. flooding.
D. loss of fertile soil.
Answer: A
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Infrared waves are often called heat waves because their energy
A. consists of frequencies lower than those of visible light. B. are the predominant waves emitted by the Sun. C. emanates from relatively hot sources. D. induces resonance of molecules in the skin that becomes thermal energy.
Increased crop yields in the U.S. are the result of
A. more efficient machinery. B. the application of fertilizers. C. improved agricultural methods. D. All of these are correct.
Crystalline substances are always
A. minerals B. made of repeating patterns of atoms C. made of glass D. ionically bonded