The total volume of water in the world is 1,4 billion km3. Despite this amount, which covers three-quarter of the Earth and seems quite a lot, water shortage exists. Because 97,5 per cent of the total volume of water saline water in oceans and seas. The remained 2,5 per cent corresponds to the volume of fresh water in the world. 68,7 per cent of the fresh water, which has a little cent corresponds to the total volume of water
MORE