الأربعاء، 27 يونيو 2012

water cycle

The water cycle
The water cycle is mad of (Evaporation , Condensation , Precipitation ( rain ) )

Evaporation : The word evaporate means to change state from a liquid to a gas or vapor. The atoms or molecules of the liquid make this change of state spontaneously, and we usually think of evaporation as taking place a bit on the slow side over a period of time. This is the contrast of evaporation to boiling, where they are "actively" and "quickly" driven into the change of state.

Condensation : Condensation is the process of a substance changing from a gas to a liquid. when you get water on the inside of a window. The window has water vapour on it. The the cold rain hits the warmer surface of the window which has water vapour on. When water vapour is cooled it turns into water (a liquid. The water will then start to drip down on the inside of the window because the water vapour which was on the inside of the window has been cooled. And then turned in to a liquid!

Condensation is what the clouds are called

The water evaporates into the sky on a sunny day and becomes clouds in the sky the changing of a gas into a liquid.

Precipitation : In meteorology, precipitation (also known as one of the classes of hydrometeors, which are atmospheric water phenomena) is any product of the condensation of atmospheric water vapour that is deposited on the earth's surface. Precipitation is generated in clouds. When water vapor droplets in clouds become so large that updrafts within the clouds can no longer support them, the water will fall to the earth under the force of gravity

Why do we call all of that water cycle ? we call it a ‘ cycle’ because it is   something that happens over and over again it never stops.

 

 

 

 


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