Why does Venus have such a great difference in temperature between its "no greenhouse" temperature and its actual temperature?
A) It has a slow rotation.
B) It is so close to the Sun.
C) It has a large amount of carbon dioxide in its atmosphere.
D) It has a high level of volcanic activity.
E) It has no cooling effects from oceans.
C) It has a large amount of carbon dioxide in its atmosphere.
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Who proposed a model with the Sun (rather than Earth) at the center of the solar system, which was then tested by the other people listed below?
a. Copernicus b. Tycho c. Kepler d. Galileo
Which of the following statements about the moon is correct?
a. The moon experiences a centripetal acceleration toward earth. b. The moon has constant velocity c. There is no net force acting on the moon. d. Earth exerts a stronger force on the moon than the moon exerts on earth.
What do we mean by the "fossil record"?
A) rocks from earlier periods of the Earth's history B) samples of meteorites that fell to Earth early in its history C) remains of ancient organisms preserved in rocks D) an album by the Rolling Stones
The speed of light in diamond is 1.24 × 10^8m/s. What is the index of refraction of diamond?