discuss the strengths and weaknesses of the collision hypothesis concerning the origin of the Moon
propose that hypotheses concerning the Moon s origin be tested
argue that the Moon could not have been formed out of the typical planet-forming materials of the presolar nebula
describe one reason why the Moon s geochemical makeup should resemble that of the Earth
18. According to the passage, Mars and the Earth are similar in which of the following ways?
I. Their satellites were formed by collisions with other celestial bodies.
II. Their cores contain iron.
III. They were formed from the presolar nebula.
III only
I and II only
I and III only
II and III only
I, II, and III
19. The author implies that a nearly circular orbit is unlikely for a satellite that
circles one of the inner planets
is deficient in iron
is different from its planet geochemically
was formed by a collision between two celestial bodies
was formed out of the planet-forming materials in the presolar nebula
20. Which of the following, if true, would be most likely to make it difficult to verify the collision hypothesis in the manner suggested by the author?
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