There has been testing and research done on the upper mantle of the earth A mineral called wadsleyite, holds about 3% water by weight. And the estimated amount of wadsleyite that exists, the water contained in it works out to be about 30 of our oceans. 30 oceans worth of water is more than enough to flood the earth to the highest mountain.
Where did the water come from? It has often been claimed by creationists that there was a canopy. Of course evolutionists laughed at that idea. But another idea has come up that has supporting evidence. When air bubbles in rock or amber in the lower layers. It always has higher oxygen. And if they are able to measure the pressure when it's trapped in amber. It's always twice the pressure we have now.
Higher barometric pressure translates into an atmosphere that can hold a lot more water. In fact when the barometric pressure exceeds a certain amount, rain clouds cannot form. Which would explain why there was no rain before the flood.
Now a meteor hit of a certain size and weight would cause some major atmosphere changes including barometric changes because of the impact. Sudden drop of the barometric pressure would cause water to be released from the atmosphere. Which brings up another problem that evolutionists will point out. That much condensation creates so much kenetic energy that it would broil the earth. They would be right, except for one thing they fell to ponder.
When the clouds and rain covered the sky, there was no sun shining through. Which basically means no heat. So first the kenetic energy would have to match the sun's energy, then exceed it by several times to broil the earth. To see if this were even possible, you would have to know the math for the sun's energy.
Averaged over an entire year and the entire Earth, the Sun deposits 342 Watts of energy into every square meter of the Earth*. This is a very large amount of heatÃ¢â‚¬â€1.7 x 1017 watts of power that the Sun sends to the Earth/atmosphere system. For comparison, a large electric power plant would produce 100 million watts of power, or 108 watts. It would take 1.7 billion such power plants to equal the energy coming to the Earth from the SunÃ¢â‚¬â€roughly one for every three people on the Earth!
So the kenetic energy produced was God's way of keeping the earth warm while the sun's rays were being blocked.
Then we have the idea that water could go down into the upper mantle and stay there. How did it get there without boiling off?
The water for the flood was 7 miles above the earth's crust (sea level), and 6 miles to the deepest ocean. Pressure applied to water increases the boiling point. According to scuba diving books, every 33 feet you descend into water equals 1 atmosphere. One atmosphere = 14.7 psi. So you take how many feet are in a mile. Divide that by 33. And you get how many atmospheres are in one mile. Times that times 13 miles and you get the least amount of pressure for the least amount of water required to cover the earth for the flood. After you have the amount of atmospheres in 13 miles of water, you times that times 14.7 and you get the actual pressure at the bottom of the ocean during the flood.
According to scuba diving books, every 33 feet you descend in water, doubles the atmospheric pressure. There areÃ‚Â 5,280 feet in a mile. So 5,280 times 12 = 63360 feet, which equals 1920 atmospheres (63360 divided by 33). 1920 atmospheres equals 28,216.2066837 psi. Now the average boiling point of water at 30.00inHg is 212.15 F. So if you times 30.00inHg times 1920 atmospheres equals 57600.00inHg. The boiling point of water at this atmospheric pressure is 106820.27 F. And also keep in mind that salt in the water will raise this even higher. But we will keep this simple. Wadsleyite, the mineral that holds the water that receded from the flood, stays around 1832 F or more. So 106820.27 F is well within range for the water from the flood to go into this mineral without boiling away.
From there you can figure a boiling point. But remember, water can only reach a certain boiling point and can go no higher regardless of pressure. You can research this on the web. The other point is that salt raises this boiling point (much like antifreeze raises the boiling point of water in a car radiator) along with any other mineral that was present. So if would be safe to add 10 - 30% higher boiling point when figuring this up. I did not figure up the math for this here because I think people should see this for themselves.
Side notes: Black smokers shoot water out at over 700 degrees F. This is due to the black smoker being deep in the water where great pressure exists (several atmospheres). And it has been known that some upper mantle minerals have held water at temps around 1000 degree C. This is due to extreme pressures, and the mineral's capability to increase the boiling point.
Other math if needed:
The Radius of the Earth = 3963 miles
The Radius of the earth with 5 miles of water = 3968 Miles.
The volume of the earth = 260711882973.3396 cubic miles
The volume of the earth with water = 261699925947.5533 cubic miles.
261699925947.5533 - 260711882973.3396 = 988042974.2136999965
So the volume of the flood water = 988,042,974.2136999965 cubic miles. But lets round it to 988,042,974 Cubic Miles.
If this water was put into a sphere, it would have a radius of 618 Miles.
Then we have the Pangea:
The earth's crust has actually expanded twice.
In Genesis 1. the whole earth was covered with water. Then it had to recede into one place so that the land could appear. This means that the water went underground. And to go underground, the earth's crust had to expand. This made the Pangaea where all the continents were together.
When the barometric pressure fell, and the atmosphere released the moisture that it held. It released the 30 oceans worth of water. When the flood water ran off the surface of the earth and into the upper mantle. The earth's crust had to expand again in order to receive it. This caused the continents to break apart and still look like they were together at one time.
The video in which I will leave a link to, shows how the earth would look if there was no water under the crust. This will shock you because it answers questions that even science has no answer for. Then it re-expands the earth to show how it looks today. the person who did this animation is not a creationist. And his views do not support it. But as he challenges his own peers, he actually proves the point of the bible with his animation.
Fresh water vs salt water Q and A:
1) Where did the fresh water come from after the flood?
Before the flood, there was no rain. What this means is that the hydro-logic cycle was not working as we know it today. So the only thing that existed was streams and lakes (if any existed) of salt water. This is because the hydro-logic cycle separates the water from the salt. So the only way for fresh water to be on the earth's surface is if a spring brought it up.
2) How did the salt water fish survive?
So after the flood, when the hydro-logic cycle was working because the barometric pressure had fallen enough for it to work. The salt water evaporated leaving behind the salt. So when it rained, it rained fresh water. The fresh water run off eventually filled our lakes and streams. And because it was done gradually, the salt water fish adapted to it and became fresh water fish.