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How do scientists think that Earths oceans formed?

User MmmHmm
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Our scientists believe that just after the world was formed, it was very hot and dry. Theory also suggests that millions of water-rich comets and asteroids bombarded our planet around 3.8 billions years ago, explaining why oceans later appeared. 
User Artjom
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Craters hit the earth and rain came down.
User Faysou
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