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Saturday, December 11, 2010

How important is WATER ?

Water is very important for life. We need water to drink, to wash our hands, to cook, to water plants and many other things. What other important uses for water do we have?
Without water, the plants would die and people and animals would go thirsty.
Did you ever wonder why water was so important? Do you know why water is water? 

Let's take a closer look at water...
Your body is made up of many bones. All these bones make up your skeleton. 

When you get out of a pool, did you ever wonder where the water on your body goes as you begin to dry? 
The water on your body changes to a gas called water vapor. Water turns into a gas through a process called evaporation. Heat makes water evaporate faster. 

All air has some water vapor. Tropical rain forests and deserts are both hot. One is drier than the other. Where will water evaporate faster- in the rainforest or in the desert? Click on the picture that matches your answer.
Water evaporates faster with moving air. Warm, fast moving air makes water evaporate faster. These wet clothes are drying in the warm wind.

What happens to water vapor if it is in a cool place?

Water vapor may condense to liquid water as it cools. This is what happe ned to the water vapor from your mouth as it touched the mirror. The mirror was cold and so the water turned back into water droplets. Condense is the opposite of evaporate. 

Dew is a form of condensed water vapor. You can see dew in the morning on your lawn. Water droplets formed overnite as it became cooler.
Frost may form as the air gets colder. You may have seen frost on the windshield of your car and your mom and dad scraping it off. Frost is ice crystals that form on objects. Look at the frost on this pine cone.



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