Just a quick note to make you think, inspired by this post over at Mountain Beltway. (Check out the comments to see what the rock actually from). I had forgotten, but the top of Mt. Everest is made up of dolomite which is only formed at the bottom of the ocean. In fact, a lot of Mt. Everest is made up of ocean-based sedimentary rock. There are fossils of trilobites, a purely ocean dwelling animal, in the tallest mountain on Earth.
Think about that for a second.
The highest point on our planet, is made from rocks formed in the deepest parts of the ocean. Plate Tectonics is a pretty darned amazing thing.