Suppose the sky is completely covered with a thin, white, layered type of cloud; yet on the ground objects cast a distinct shadow. Which of the following cloud types must be present?
A. nimbostratus
B. stratocumulus
C. stratus
D. cirrostratus
Answer: D
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"The Tragedy of the Commons" is based on the view that
A. Only privatization or strict laws can overcome people's selfish and greedy nature. B. Open access systems can be sustained and promoted. C. Communal systems can be sustained and promoted. D. Individuals will try to maximize gain for the group at a loss for the individual. E. Community members will attempt, without success, to sustain a resource for future generations.
ANSWER: period?
At the current rates of use, the United States has enough coal to last the next
A) 20 years. B) 40 years. C) 100 years. D) several centuries.
Which of the following does not belong with the others?
A) Continental glaciers B) Cirque glaciers C) Piedmont glaciers D) Alpine glaciers E) Valley glaciers