Where did all this water we currently have on Earth come from?
Evian?
From hydrogen, the most abundant element in the universe and oxygen, the third most common element in the universe.
Turns out there is enough underground water deep in the Earth’s crust to cover the world several times over. Recent story on that. Will see if I can find it.
OK here it is: http://m.phys.org/news/2014-01-ocean-beneath-feet.html