Do oceans of water in mantle rock prove the flood?

You mean, if there was a 400 mile deep hole in the ground? Then if you threw water down it, it would boil on the way down and come back up as steam. Also I suspect the hole would immediately turn into a volcano or otherwise close itself up. (What would happen if there was a mile deep hole in the sea?)It's hard to do things against pressure. The tires of your car, for example, have a pressure of about 250 KPa, two and a half times atmospheric pressure. So you can't just open the valve of the tire and wait for air from outside to flow in, because it won't. That's thermodynamics for you. Instead, you need a machine that pumps air in by artificially creating a higher pressure outside than inside. The machine needs a power source. This is not the sort of thing that happens by itself.

Well, a creationist answer might be that God magicked it there when he magicked the rest of the Earth into being.For a non-creationist answer, see post #41. The Earth, astronomers say, accreted. We know that there's plenty of ice in the solar system, e.g. comets. So chunks of ice would have got squidged into the mix.

I was describing the origin of the Earth. If you will agree with me that the Earth formed naturally by accretion, I shall be delighted. Then I'll see if I can interest you in a naturalistic account of the origin of species. And then it leaped off the Earth, achieving escape velocity, and then turned on its rockets to maneuver itself into completely different orbits from Earth.But you never invoke anything supernatural or miraculous.In any case, I have now provided you with two explanations of how the hydroxide got in the ringwoodite --- a dumb creationist one, and a non-dumb non-creationist one. There you go.

So when the Flood was busy fooling paleontologists by stacking the fauna to make the fossil record reflect the theory of evolution, and while it was fiddling with the radiometric dates to make the Earth look old and fool the geologists, some part of "the Flood event", but not the Flood itself, was doing stuff in space to deceive astronomers? Something that the Bible doesn't mention, but which you can daydream about in terms so vague that it's impossible to form a mental picture of what you can possibly be thinking of?

There's a lot of nonsense in there.Take this one. Now this is just equivocation. What they need is short --- incredibly short --- intervals between the reversals. What they have is a couple of (real) scientists saying that the reversals themselves are quick.It's like someone trying to compress American history into a few weeks by saying, yes, we've had 44 Presidents, but the process (inauguration) where we change from one President to another only takes a few hours. And -then they say, "See, our American-history-only-takes-a-few-weeks model predicts that inaugurations should be quick. Behold the awesome predictive power of our theory!"