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Where did Earth's water come from?

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The planets in our solar system are made up of varying formations of rocks, water (ice), and gases. Scientist have figured out where most of these materials come from except water. This led to more research and eventually ...the question: "Did water come from a galaxy far, far away? Realizing that water just wasn't here from the beginning, they had more discovering to do to explain its origins.

Which one of the following things was not part of the original formation of Earth?

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