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Of course mainstream science doesn't agree that the entire surface of the planet was ever covered. However, the highlands would have been significantly lower during the earlier stages of the continental movements which built many of the mountain chains. The highlands would also be the last, and most briefly covered, and would only have received a light sprinkling of sediment. Highlands also preferntially erode more quickly. There are many reasons to not expect to find evidence for a complete covering of the earth.
I just found this forum today and don't know what all's been covered, but here's my take on the preflood and postflood surface of the earth.
1. Before the flood the majority of our ocean waters were in the atmosphere providing a protective terrarium canopy over the earth.
2. My understanding of the earth's crust is that the average thickness under the oceans is about 3 miles, whereas the average of the continents is 20 miles thick.
3. When the first rain came (the flood) the weight of the water sank the thinner crust areas into the molten core creating the deep oceans.
4. The displacement of the core occupied by the deeper oceans forced the mountain ranges up, creating the islands and mountain ranges.
5. It took less water to originally cover the earth than it would for the earth as we know it now because the sinking and the uplifting would take some time for it all to consumate.