When was the federal ban on chlorofluorocarbons (ozone-depleting chemicals) enacted?
A. 1964
B. 1969
C. 1974
D. 1978
E. 1984
Answer: D
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The hydrologic cycle is driven primarily by
a. solar energy and gravity b. solar energy and the moon c. solar and mechanical energy d. mechanical and chemical energy e. chemical energy and the moon
In order to switch to sustainable agriculture, which of the following practices would not be favorable?
a. Give subsidies and tax breaks to those that use the method. b. Shift to full-cost pricing. c. Increase government support of research on sustainable agriculture. d. Expand the use of the crops of the green revolution. e. Discourage monocultures.
What is the main reason our knowledge of the Earth increased dramatically starting in the 1950s?
A. The cold war started. B. More scientists started studying the Earth. C. Improved technologies provided more data.
Very cold air is usually associated with
a. low density. b. cyclones. c. high humidity. d. high pressure.