Which of the following is a chemical property of silicon?
A. its density
B. its ability to react with oxygen
C. its melting point
D. its ability to conduct electricity
E. both C and D
Answer: B
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The half-life of radioactive parent isotope Q is 1000 million years. Scientists testing a rock sample discover that the sample contains three times as many daughter isotopes as parent isotopes. What is the age of the rock?
- 1,000 million years
- 2,000 million years
- 3,000 million years
- 4,000 million years
In a small pond that averages about 6 feet deep, eutrophication typically produces
A) low levels of dissolved oxygen and abundant amounts of submerged aquatic vegetation. B) low levels of dissolved oxygen and no submerged aquatic vegetation. C) high levels of dissolved oxygen and abundant amounts of submerged aquatic vegetation. D) high levels of dissolved oxygen and no submerged aquatic vegetation.
The trade-wind inversion
A) is caused by the rising of warm surface air. B) is most common at high latitudes. C) causes convective cumulonimbus and resulting thunderstorms. D) causes stratocumulus over colder ocean waters. E) is unrelated to Hadley Cell circulation.
Reaching and exceeding a ____ is somewhat like stretching a rubber band until it breaks.
A. negative feedback B. positive feedback C. tipping point D. time delay E. synergistic point