Should the Earth Even Have Water?

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"Water, water, every where"...or so that one poem goes. And it's kinda right, because there's way more water INSIDE the Earth than on the surface. But scientists still don't know with certainty exactly how Earth got all of that H2O.

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Sources: https://docs.google.com/document/d/e/2PACX-1vQtlS8vZIW7G_F4ZGhMM3j8iU6aqb9T86n4sdR8YRe8OnPbQVTuJMCjd_QTx8T9ZJJ6xvnc0dSYQuOW/pub