A geological formation that contains a suitable amount of water to be accessed for human use is called a(n) ?
What will be an ideal response?
Aquifer
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Why does Jupiter have several distinct cloud layers?
A) Different gases are present at different altitudes in Jupiter's atmosphere. B) Clouds form randomly, so on average there are always several layers. C) Different layers represent the various regions where the temperature is cool enough for liquid water to condense. D) Winds prevent clouds from forming at some altitudes, so we see clouds only at the other altitudes. E) Different layers represent clouds made of gases that condense at different temperatures.
A rock is thrown upward with a speed of 12 m/s on the surface of planet X where the acceleration of objects in free fall is 1.5 m/s2 and there is no atmosphere. How long does it take for the laser to reach the maximum height?
A) 8.0 s B) 11 s C) 14 s D) 16 s
Which of the following is suggested as the best explanation of the missing solar neutrinos?
a. The Sun is fusing helium but not hydrogen. b. Nuclear reactions do not produce neutrinos as fast as theory predicts. c. The Sun may contain matter we haven't yet identified. d. Neutrinos may oscillate between three different flavors. e. None of the others.
Left undisturbed, the footprints left on the Moon by the Apollo astronauts will likely
A) already have been erased by erosion. B) remain visible for a few more decades. C) remain visible for millions of years. D) remain permanently visible on the Moon.