Which would you expect to be more viscous, a polymer made of long molecular strands or one made of short molecular strands? Why?
A. short molecular strands because of a greater density
B. long molecular strands because of a greater molecular mass
C. long molecular strands because they tend to tangle among themselves
D. short molecular strands because their ends are typically polar
Answer: C
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According to the Köppen system of classifying climates, which of the following letters designates dry climates?
A. climate A B. climate B C. climate C D. climate D
Which of the following pairs of events appear to be linked?
A. increased atmospheric carbon dioxide and low pH in the ocean B. increased atmospheric carbon dioxide and increased temperature of Earth C. melting glaciers and increased sea level D. All of these statements show logical linkage.
Put the steps in the correct order. 1. Stress exceeds rock yield strength. 2. Potential energy is released as motion energy. 3. Strong rocks absorb large stresses during elastic strain. 4. Rock breaks
A) 3, 2, 1, 4 B) 3, 1, 2, 4 C) 3, 1, 4, 2 D) 3, 2, 4, 1
Geothermal energy generation ________
A) is not practical almost anywhere on Earth B) provides a tiny fraction of the United States' electrical energy C) is not associated with environmental hazards D) releases hydrogen sulfide gas E) is practical almost anywhere on Earth