Why is the Earth blue?

Interesting report. A blue earth for some 4 billion years gets rather dicey with the newer giant impact model for the origin of the Moon. https://skyandtelescope.org/astronomy-news/long-lived-lunar-magma-ocean-points-to-a-younger-moon/, "Determining the duration of the lunar magma ocean can, in turn, help determine the real age of the Moon, which the team places between 4.40 and 4.45 billion years. “The fact that the magma ocean was long-lived also influences how we can infer the age of these rocks,” Maurice says. “What we have found now is that the Moon might have formed much later than previously thought, as much as 100 million years.”

Then there is the Faint Young Sun problem discussed briefly in the report and snow ball earth. The Faint Young Sun is a problem for an ocean 3.8 or 3.5 billion years ago and we know Precambrian fossils like stromatolites were there too along with microbes similar to the present earth, dated 4.28 billion years old. The origin of Earth's oceans when the Moon is a magma body 4.4 billion years ago in the new giant impact model is very interesting.
 
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