Gradational boundaries between different sedimentary rock types can form from
A. a progressive change from one environment to another.
B. slowing of the current over time.
C. a gradual rise or fall in sea level.
D. All of these choices are correct.
Answer: D
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Alternative fuel vehicles
A) answer the demand for the service of a personal vehicle and reduced fossil fuel demand. B) are a new consumer line promoted by the Big Three after the bailout. C) have promoted removing trolley lines in cities. D) are produced in developing nations only. E) because of their low cost, production cannot meet existing demand.
In some instances a single mineral, a ________, suffices for determination of the pressure and temperature under which a metamorphic rock formed.
A. metamorphic pressure-temperature mineral B. metamorphic index mineral C. metamorphic key mineral D. metamorphic trace mineral E. metamorphic mica mineral
The U.S. government created Superfund to deal with
A. high-level radioactive waste disposal. B. municipal solid waste disposal. C. municipal sewage treatment. D. toxic-waste site cleanup.
How did the conditions in the atmosphere over Antarctica lead to the formation of the ozone hole?
What will be an ideal response?