10 facts about water and the environment

• Water is the only substance found naturally on earth in all three forms, as liquid, solid and gas
• 80% of the earth's surface is water
• 97% of the earth's water is saltwater in oceans and seas. Of the 3% that is freshwater, only 1% is available for drinking - the remaining 2% is frozen in the polar ice caps
• Once evaporated, a water molecule spends ten days in the air
• 40% of the atmosphere's moisture falls as rain each day.
• A person can survive for a month without food, but less than a week without water
• There is exactly the same amount of water currently on earth as there was when the planet was formed
• In a 100-year period, a water molecule spends 98 years in the ocean, 20 months as ice, around two weeks in lakes and rivers and less than a week in the atmosphere
• Water serves as nature's thermometer, helping to regulate the earth's temperature
• 3.79 litres of water weighs 3.79 kg

Sources:
water.org 
randwater
 

Read more:
8 glasses a day a myth