Respuesta :
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.
Explanation:
The outside-in model is best supported by the NASA's DAWN mission sent in 2007, which found the evidence of water on Ceres and Vesta, the largest asteroids in the asteroid belt. Also scientists have discovered opals in meteorites which need water to form, another indication that water came from space rocks. Comets are made up of ice, gas and dust which shows that may be it came from comets.
