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There are about 130 million square miles of ocean, or 3.6 trillion square feet. And 147 billion cubic feet in a cubic mile.
Take 5,000 cubic miles times 147 billion, then divide by 3.6 trillion and you get..
A headache.
And 2.4 inches, worldwide.
Someone check my math...
The fresh water Black Sea flooded with salt water around 5600 BC. Probably Noah's Flood.