Which of the following provide scientists with evidence that Earth's interior has distinct layers?
A. Mapping of the deep ocean floor.
B. Differences in gravity within Earth's interior.
C. Behavior of seismic waves traveling through Earth's interior.
D. The effect of the Moon on Earth's tidal forces and solid rock.
E. Drilling of deep oil and gas wells.
Answer: C
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A role of unpaired valance electrons is that they
A. take part in the formation of different types of bonds. B. keep the paired electrons separated to minimize interaction. C. are the nonbonding electrons. D. tell us which Lewis dot structure is correct. E. provide the number of Lewis dots.
The sun's radiance usually has a ____ variation
A) 1% B) 10% C) 20% D) 40%
What evidence is indicative that glaciers once existed in an area?
A) glacial till deposits B) horizontally aligned sediment deposits C) striations scratched in outcrops D) both A and C
Globalization of the economy has
A) leveled economic differences between places. B) heightened economic differences among places. C) decreased investment in less developed countries. D) drained resources from more developed countries. E) decreased regional specialization of production.