The Waters of Noah's Flood

I'm sure there's enough water on earth to have flooded the whole surface of the earth in Noah's day. 

On Day 1 of creation, the whole planet was covered with water.

On Day 2 an atmosphere was created with some water being in or above the atmosphere while the rest of the water still covered the entire surface of the earth.

On Day 3 much of the surface water must have gone underground, and perhaps it was a single land mass - the Pangea if you like - that appeared. Just maybe. And if so, mountains might not have been as high as they are today.

At Noah's flood, some of the water in or above the atmosphere, plus that subterranean water (which had once covered the surface, before it went underground), was released to cover the surface again. 

It rapidly laid sediment and fossils and affected land forms.

After the flood, the water began returning underground.

As water slowly went underground again, humans and animals repopulated the Pangea.

After some time (perhaps a hundred years later) the Mantle may have become saturated with the water. It may have been a period of volcanic activity. The Pangea may have split and continents may have drifted rapidly and collided, lubricated by the excessive water in the Mantle. 

This would have rapidly formed the current shape of the continents, and quickly formed higher mountains like the Himalayas. 

As the water subducted even deeper,  the Mantle might have become less lubricant, continental drift would have slowed, almost stopped. That's the situation today.

Seismic cracks observable today under the oceans mean that there is likely more water that has been transported to under the earth  than has remained in the oceans.

As the water removed to under the earth some of it became physically trapped.

Some of the water also became not just physically trapped but also chemically bound in rock.

Some of the water would have come under so much pressure, it would have heated, and some hydrogen may have separated from oxygen as a result.

Some of the water trapped in rock sometimes gets forced to the surface again. 

Some of the hydrogen gets heated under pressure, rises and binds with oxygen to form water again.

This may be an ongoing cycle which releases or binds to electrons in the process, which helps give the earth its magnetic field.

But most of the underground water may now be too deep to be involved in that cycle. This deeper water also helps explain the earth's magnetic field.

Diamonds, formed deep below, require a watery environment to form. Pressure then forces them closer to the surface.

Sometimes minerals are found trapped in the diamonds - minerals whose composition reveals the watery environment they came from. 

As time goes on, scientists will find increasing evidence of volumes of water in the earth. Leaving those who said there isn't enough water for a worldwide flood with egg on their faces.

Respecting God's Word is the fountain of scientific accuracy.