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Earth's Water was Present During Planetary Birth (Discovery)
"Analysis of water samples from Earth's deep mantle suggest that the planet's water has been present since Earth's formation, a finding that has implications for other rocky bodies in the solar system and planets beyond as well, a study released on Thursday shows."
Earth may have kept its own water rather than getting it from asteroids (Science Magazine)
"Carl Sagan famously dubbed Earth the "pale blue dot" for our planet's abundant water. But where this water came from-and when it arrived-has been a longstanding debate."