Scientists have long pondered where the Earth's water came from. Common hypotheses include that it arrived on meteorites or that it gradually oozed up from inside of the Earth's mantle.Recent evidence supports the latter claim after scientists discovered traces of water in certain minerals from within the transition zone deep inside the planet.
Source: Twitter @AfricaSeenHeard
Could there be an entire massive "ocean," hundreds of miles below our feet? These researchers think so.