Summarize some of the evidence suggesting that Mars once had flowing water
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It has what looks like dried-up riverbeds and impact craters that appear to have formed in mud; the Mars Pathfinder found rocks of many different types jumbled together, as would occur if there had once been a great flood in the region; some very old craters appear to have been eroded by rain.
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If you drove day and night without stopping for one year without exceeding the legal highway speed limit in the United States, the maximum number of miles you could drive would be closest to
a. 8700. b. 300,000. c. 500,000. d. 1,000,000. e. 32,000,000.
Every second at Niagara Falls, some 5000 m3 of water falls a distance of 50 m. What is the increase in entropy per second due to the falling water? (Assume a 20°C environment).
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The right ascensions and declinations of stars stay approximately but not perfectly constant with time. What causes these coordinates to gradually change, enough to be noticeable with telescopes in just a few decades?
A) the precession of Earth's axis B) changes in Earth's orbit around the Sun C) tidal effects of the Moon D) the motions of stars relative to the Sun
Identify a true statement about planets
A) They are the size of the Sun. B) They shine by reflecting sunlight. C) There are nine planets in our Solar System. D) There generate energy by nuclear fusion reactions.