Scientists have long debated the exact timing of the lunar cataclysm, a period approximately 4 billion years ago when Earth and the Moon were pummeled with asteroids. A clue to this puzzle may come. A. senior scientists in industry have been less likely than junior scientists to remain in positions where opportunities to conduct their own research are restricted B. scientists who work in industry can gain. Before 1965 many scientists picturedthe circulation of the ocean's water mass as consisting of large, slow-moving currents, such as the Gulf Stream. That view, based on 100 years of observations made.

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