For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.
Tim Ranck
The average depth of the ocean is 2.3 miles (3800 meters)! After the fountains of the great deep burst open as recorded in the flood story, earth had to reach new equilibriums, most of which was probably driven by gravity.
Check out Walt Brown's hydroplate theory at creationscience.com, he has a phd from MIT in engineering.