All About Water
How Nature Purifies Water
Water is essential to all life. Without it the biosphere that exists on the surface of the earth wouldn't be possible. Nicknamed the "water" planet, earth is covered by one of our most precious resources. However 97% is locked in the oceans, toxic to humans and many plants and animals. How do we obtain fresh water resources then?
Hydrologic Cycle
To understand, we need to turn to the Hydrologic Cycle. The Hydrologic Cycle (also called the water cycle) is the process that moves water around the earth. The cycle starts with the sun heating water in our rivers, lakes and oceans and turning it into water vapor that rises into the air (called evaporation). When water vapor cools it forms clouds (condensation) that become heavy with water and rains back to earth (precipitation).
Water is Not Created or Destroyed
It is this process that cleans the Earth’s water. Water is not created or destroyed. Simply put, it is continually changing location and form. The water you drink today may have been lapped up by dinosaurs millions of years ago, or helped fill Julius Caesar’s bathing pool. The water we use now is the same supply the human race started with. Its quality is renewed again and again by the natural Hydrologic Cycle. |