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The Formation of Water & Atmosphere:As the Earth cooled even more over time, it formed a primitive _____. The solid crust was covered with active _____ that spewed out gases like water vapor, carbon dioxide, and ammonia that add to the _____ and ______ from the original solar nebula. Light from the Sun broke down the _____, releasing _____ into the atmosphere. It wasn't until the evolution of _____ a few billion years later that the atmosphere contained oxygen.The _____ that was in the atmosphere condensed and formed clouds. As Earth cooled more, the water vapor formed droplets in the clouds, and it started to _____. This water, along with the ice from the comets, formed the _____ and ______. The water was all fresh at first but eventually became salty as _____ from the Earth's crust were mixed in.

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