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The origin of continents and oceans has long been a subject of scientific inquiry, and several hypotheses have been proposed to explain the formation of the Earth's major land and water bodies. Among the early theories, the Planetesimal Hypothesis and the Tetrahedral Hypothesis are important because they attempted to explain the evolution of the Earth's surface before the development of modern plate tectonic theory. Although these hypotheses are no longer accepted as complete explanations, they played a significant role in the history of geological thought. The Planetesimal Hypothesis was proposed by Thomas C. Chamberlin and Forest R. Moulton in the early twentieth century. According to this hypothesis, the solar system originated when a massive star passed close to the Sun. The gravitational attraction of the passing star pulled out streams of hot gaseous material from the Sun. As this material _______ _________ ____ ____ ___ __________ _____ ________ __________.
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