“I can tell you that if the amount we have observed is spread out over the entire Earth, there's the potential for there to be more water inside the Earth than in the oceans."
- Steve Jacobsen, Ph.D., Geophysicist, Northwestern Univ.
June 26, 2014 Evanston, Illinois - 71% of Earth's surface area is water. Earth ocean depths can be as much as five to six miles — and even 6.8 miles deep in the Pacific's Mariana Trench. How did so much water end up on a planet that began as boiling hot with lava all over its surface? This question has baffled scientists for a long time. Theories have included comets crashing into Earth and leaving their ice to melt. But could comets provide all the water that's filled Earth's oceans and seas? No one knows exactly when the first ocean filled, but estimates are as long ago as 3.8 billion years.
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