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Sunday, August 10, 2014

Precious Water

In the images from outer space blue oceans cover nearly three quarters of the surface of the earth. All but 3% of the water is salty. Most of our fresh water is locked in polar ice!


In understanding the water cycle we can see that evaporation is constantly drawing water up from the oceans into the atmosphere and eventually precipitating back down to earth as rain.

http://www.whoi.edu/page.do?pid=80696&i=7301
The rain refreshes and cleans the land as it washes down into the receiving waters. The run-off provides us with renewed fresh water in our streams, rivers, lakes and can help to refill our underground aquifers. Water always seeks it's own level, eventually finding it's way back to the sea again.

In the illustration to the left you can see all of the surface water rolled up into a ball on top of the mass of the planet.

Just to the right there is a much smaller blue ball that represents available fresh water. That tiny blue ball is our most precious resource!










www.ausmepa.org.au

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