What does the Greenhouse Effect cause?
A. It shields us from the Sun's ultraviolet rays.
B. It protects the surface of Earth from cosmic rays.
C. It causes Earth's surface and atmosphere to be warmer than they would be otherwise.
D. It is the main source of Earth's oxygen.
Answer: C
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Atmospheric pressure at an altitude of 10,000 m is exactly half of what it is at 5,000 m
Indicate whether the statement is true or false
The mercury column in an ordinary medical thermometer doubles in length when its temperature changes from 95? F to 105? F. Choose the correct statement:
A. the coefficient of volume expansion of mercury is 0.1 per F? B. the coefficient of volume expansion of mercury is 0.3 per F? C. the coefficient of volume expansion of mercury is (0.1/3) per F? D. the vacuum above the column helps to "pull up" the mercury this large amount E. none of the above is true
From the fact that virtually every galaxy is moving away from us and more distant galaxies are moving away from us at a faster rate than closer ones, we conclude that
A) the Milky Way Galaxy is expanding. B) we are located at the center of the universe. C) the farthest galaxies will eventually be moving faster than the speed of light. D) the universe is expanding. E) the universe is shrinking.
Relative to a fossil-fuel plant, a nuclear power plant produces
A) more electricity. B) less heat and smoke. C) less pollution. D) all of the above E) none of the above