Choose the most appropriate answer for each question.
  • Question 1 :
  • Spring tides occur when the Sun and Moon line up, since the _________ of the two bodies add together to create larger tidal forces. Neap tides occur when the Sun and Moon are at right angles to one another as seen from Earth. In this case, the gravitational forces counteract each other, creating weaker tidal forces. — Neil F. Comins, "A New Slant on Earth", Astronomy, Vol. 20, Iss. 7; pg. 44, 6 pgs; Jul, 1992 Rear Adm. Harry Hill, put in command of the amphibious force, consults with local mariners and reaches a cautious consensus that neap high tide in the lagoon on November 20 will surely be close to five feet deep. — Michael Kernan, (Tarawa) "...heavy fire...unable to land...issue in doubt.", Smithsonian, Vol. 24 Issue 8, p118, 11p, 1c, 9bw, Nov, 1993 ... and neap tides (tides that occur during the first and third quarters of the moon and that have the least difference between high and low tides), ... — Richard M. Schlenker and Sarah J. Yoshida, "Developing Science Activities", Science Activities, Vol. 32 Issue 2, p34, 7p, 3 charts, Summer, 1995
    1. gravities
    2. gravity
  • Question 2 :
  • Most of the ship's mass would be Cererian water; Earth would supply the crew, the ship's skin, and the engines. Ceres' surface _______ is about 1/36 Earth's _______, and the asteroid is just close enough to the sun for it to power the machinery. Cererian water may unlock the solar system.
    1. gravities
    2. gravity
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Source: Wiktionary
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Difficultness: Level 2
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Definiteness: Level 8
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