Which of the following is NOT considered an unconventional fossil fuel?
a. Methane hydrate
b. Oil shale
c. Oil sands
d. Coal
Answer: D
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The cutting of large trees in a natural forest and subsequent sale of the logs for timber, is an example of
A) the consumptive use of a natural resource. B) the productive use of a natural resource. C) the minimum sustainable yield of a resource. D) the carrying capacity of a population.
The water in wetlands is
A) always freshwater. B) always saltwater. C) either freshwater or saltwater. D) too polluted to use as a water resource.
The most recent North American glaciers reached their maximum thickness and extent between about ____
a. 700 and 600 million years ago b. 65 and 55 million years ago c. 2.5 and 2 million years ago d. 50,000 and 45,000 years ago e. 26,000 and 20,000 years ago
During which of the following stages do downdrafts spread throughout a thunderstorm?
A. developing stage B. precipitating stage C. cumulus stage D. dissipating stage