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Q&A How big would the ice ball have to be to deliver all the water at once?

One popular theory to explain how Earth got its water is that it was delivered by asteroid/comet/etc. The form this theory usually takes is that many small impacts occured over a long time, each d...

4 answers  ·  posted 5y ago by Dalila‭  ·  last activity 5y ago by Dalila‭

Question environment planets geography geology