24) Choice A is correct. The question asks what Schmidt would disagree with in the rapid-collapse theory. Choice A is correct: According to Schmidt’s own theory, “cosmic dust gradually lumped into ever-larger conglomerates”; this means that planetary formation was a prolonged process, while in the rapid-collapse theory, it happened quickly. Choice B is incorrect: Both theories agree that Moon craters were caused by the impact of cosmic bodies that crashed into the Moon’s surface. Choice C is incorrect: Both theories agree that cosmic dust was the material from which the planets ultimately formed.
25) The “observation” mentioned in the passage is the finding that Moon’s craters “were caused by the impact of objects that were in great abundance about 4.5 billion years ago but whose number appeared to have quickly decreased shortly thereafter.” The answer choice that is closest in meaning to this description is Choice D.
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