The outside-in model states that most of earth's water came from meteorites or comets. what evidence would support this model?

According to the Outside-in Model, most of Earth's water arrived after the Earth Formed, from meteorites or comets. This water would have mixed with the material in Earth's upper layers and also come to the surface through volcanic action. More supporting evidence comes from NASA's DAWN space craft launched in 2007, which found evidence of water on ceres and vesta, the two largest objects in the main asteroid belt located between Mars and Jupiter. 

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