Which of the following worlds has the greatest difference in temperature between its "no atmosphere" temperature and its actual temperature?
A) Mercury
B) Venus
C) Earth
D) the Moon
E) Mars
B
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This famous photograph taken by the Voyager spacecraft shows
A) Earth as viewed from the outskirts of the solar system. B) a close-up of the rings of Neptune. C) the cloud of gas and dust in which our solar system was born. D) the Sun as viewed from the next-nearest star.
Changing the orbit of a spacecraft by firing thrusters is an example of
A) Newton's first law of motion. B) Newton's second law of motion. C) Newton's third law of motion. D) the universal law of gravitation. E) none of the above.
Air currents are sensitive to changes in pressure and temperature. In general, air moves from regions of
A) high pressure to regions of low pressure. B) low pressure to regions of high pressure. C) high temperature and low pressure to regions of low temperature and high pressure. D) low temperature and high pressure to regions of high temperature and low pressure.
Breeder reactors
a. produce plutonium from 238U. b. use 238U as a fuel. c. produce 235U from 238U. d. produce 238U from 235U.