The power of water

Water is the driving force of all nature - Leonardo da Vinci

The amount of water on Earth hasn’t changed since the planet was formed two billion years ago. 

Approximately 97% of the water on Earth is salt water. Only  3% is fresh water. Of that  3%, most is frozen in the polar caps of  Antarctica. The  remaining 1% is found in lakes, reservoirs, rivers, streams, and beneath the ground.  

Water moves around the Earth in a water cycle. In one century, the average water molecule spends 98 years in the ocean, 20 months as ice, about two weeks in lakes and rivers, and less than a week in the atmosphere. Much of the Earth’s water remains locked in glaciers and polar ice for thousands of years.