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Earth’s surface is covered by more than 70% water, but scientists think that when Earth first formed it did not have any water. Which of the following could be a possible explanation for how the Earth obtained its liquid water? A. Impacts from meteorites and comets delivered water to Earth. B. Ice locked up in early Earth’s core slowly melted and was released. C. Atoms of oxygen and hydrogen combined during early Earth’s formation to produce water molecules. D. Water vapor from the atmosphere condensed and rained down on the planet creating the oceans over millions of years.
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