WHEN sea water freezes, most of the salt is contained in pockets of liquid that do not freeze. sea ice thus contains between a teeth and a hundreath as much salt as sea water, and it can be melted and drunk like fresh water.
ONLY 2.8% of the Earth's water is fresh, and of that small proportion only 6% is liquid, 90% is looked up in the polar ice-caps, and the remainder is water vapour in the atmosphere. And about 98% of Earth's liquid fresh water is underground.
THE AMOUNT of water on Earth has remained the same since the planet was created some 4600 million years ago.
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