No, wrong again. The boiling point of the water is raised by the pressure that is there(there has to be enough pressure to raise the boiling point of the water to the tempature at that depth). If you release the pressure just to the point where the water cannot stay liquidfied and turns to steam it would seperate itself from the mineral which is heavier than steam and rise to the suface leaving the mineral behind. Here is a link that will give you a better idea of what I am talking about : http://www.thursdaysclassroom.com/13jul00/boil.html
I don't have much time but I'll some quick comments. The temperature is already well above the critical point of water which is 374 C. Above the critical point water is not liquid at any temperature. Thus it is not liquid water to begin with. If you release the water from magma it will still be at about 1000 C and have the heat content of water at 1000 C. If if the water somehow comes out from massive cracks you have no way to put it back after it cooks the earth to death.
There are huge fault lines all around this earth that could open and and be big enough to flow the amount of water needed. Lets not forget the water canopy. That's about half the water needed right there. Half the water above(firmament above) and half the water below(firmament below). Not as much energy needed so not much heat produced
The vapor canopy was abandoned by most creationists long ago. You can't put any significant amount of water in the atmosphere below temperatures and pressures that would cook the earth to death before the flood. You can also calculate the heat produced by the falling water and as Arikay says it will get hot while falling. It must do this because of the conservation of energy. Its potential energy when above the "firmament" must be converted to kinetic energy and end up as heat as it falls so even if you have some magic way to put water above the firmament it will cook the earth to death when it falls unless you suspend the first law of thermodynamics.
The Frumious Bandesnatch
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