If the Sun collapsed to a black hole, the time required for the Earth to orbit the collapsed Sun would
A. increase.
B. decrease.
C. stay the same.
Answer: C
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The gas that absorbs most of the harmful ultraviolet radiation in the stratosphere is:
a. water vapor. b. nitrous oxide. c. carbon dioxide. d. ozone. e. chlorofluorocarbons
The largest typical size for grains of sand that can be commonly moved by wind is
A) 5 micrometers. B) 0.5 millimeter. C) 1.0 millimeter. D) 1.0 centimeter.
The Basel Convention, signed by 105 nations, was an international agreement to control:
a) the manufacture and export of chlorofluorocarbons (CFCs). b) manufacture and export of the banned pesticide DDT. c) the international shipment of toxic waste and hazardous material. d) the use of high sulfur coal implicated in acid rain.
Deficiency of which of the following is associated with anemia?
A) folic acid B) nicotinic acid C) riboflavin D) thiamine