all of you seem to miss one great big possible fact: what if the world looked much like it did today? it was a flood right? so the flood would've filled up all of the infertile lowlands, not just created drift.
if by some chance there WAS water in today's oceans back then, by the time of the flood, there would have been already an estimated 1600 cm of drift that comes out to just over 248 feet of drift! the flood would've escalated that to another 654,721.30..... feet of drift going by the 1/2 mile per hour formula. that comes out to thirty feet short of 655,000 feet of drift, or 124 miles! then give another 6,000-10,000 years for everything to calm down, the water degenerating at 1/2 of its normal "rage", if you will, per year, it will take about 5-10 years to come to near zero, resulting in the 1 cm/yr. if we take 10,000 yrs-5=9,995. 9995/2.54/12/5280= 0.062...miles. 124+.62+122.575...=just over 246.6 miles, nearly 1/11 of the current continental drift that science said we have gone through. the scientific 4.54 billion years of evolution say that going at 1 cm/yr =28210.25213 miles. it's WAY over the 3000 miles from Boston, Massachusets to London, England, but, as you can see, not close enough. where does that extra 200 miles come from?
there is also the possibility that in the bible, 7 days is not 7 physical night, day, night, day..., but over hundreds or thousands of years, giving plenty of time for contiental drift.
i f there WAS tectonic movement, it would be worldwide. tectonic movement of ANY kind is massive with only two plates moving. now imagine all eight major plates, seven minor plates, and dozens of smaller minor plates, all moving at once. it's certainly enough to move all of the continents around, crash into each other, and move away in an instant, thus creating islands, mountains, and the way that continents don't quite fit exactly.