Water covers just over 70% of the Earth's surface and the total volume of water contained on our planet and in the atmosphere is estimated to be 1,386,000,000 cubic kilometres,
Imagine if our planet was a smooth sphere with no deep oceans and high mountains, therefore no dry ground.
How deep would the water be all around the globe?
830 metres / 2.7 kilometres / 4.6 kilometres.
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Answer to question 2 / 2.7 kilometres.
The depth of water all around the Earth would be roughly 2.7 kilometres. If that was reality then we land-dwellers would not exist.
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Questions About Space
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