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Physics: How much water is actually on Earth? |
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At a first glance, it seems to be an immense quantity of water on Earth. That is correct when we are talking about the Earth's surface, there is indeed 70% of water and 30% of "dry land". But what happens to our perception when we compare the volume and not surface?
Well just take a look at the picture, a little blue drop of water represents a whole volume of water on our planet's surface. This blue bubble has a diameter of about 435 miles (700 km), which is still less then one half of a moon. Nonetheless, amount of water hidden under Earth's surface still remains a mystery.
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