The most common form of gas in the disk of the Milky Way galaxy is ________
A) atomic hydrogen gas B) gas in hot bubbles
C) molecular hydrogen D) gas in stellar winds
A
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The greenhouse effect is the
a. trapping of infrared radiation by the atmosphere. b. accentuated growth of plants near the equator, compared to other regions. c. capturing of visible and UV radiation from the Sun the atmosphere. d. shielding of life-forms from solar UV radiation by the ozone layer.
Which terrestrial planet is about one-third the size of Earth?
A. Earth B. Venus C. Mars D. Mercury
An elevator is being lifted upward at a constant speed by a steel cable. All frictional forces are neglected. In this situation, forces on the elevator are such that
A. the upward force by the cable is equal to the downward force of gravity. B. the upward force by the cable is smaller than the downward force of gravity. C. the upward force by the cable is greater than the downward force of gravity. D. None of these choices are correct (the elevator goes up because the cable is being shortened, not because an upward force is exerted on the elevator by the cable)
CFCs are
a. alcohols. b. hydrocarbons. c. alkyl halides. d. amides.