Question

What are some of the theories on the origin of earth's water?

Answer 1

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The origin of water on Earth, or the reason that there is clearly more liquid water on Earth than on the other rocky planets of the solar System, is not completely understood. There exist numerous more or less mutually compatible hypotheses as to how water may have accumulated on Earth's surface over the past 4.5 billion years in sufficient quantity to form oceans.

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