Its estimated that approximately 2/3's of the earths surface is covered by water. Roughly 326 million cubic meters of water in the earths oceans alone; staggering! This does not include the water locked in the polar ice caps, nor in the bodies of organic life. Ground water, lacustrian environments, and the atmosphere all contain large amounts of water as well. The question is: Where did all the earths water come from? This question was first put to me by Rolfe Erickson, Professor of ...