7th Class Science Water Scarcity of Water

Scarcity of Water

Category : 7th Class

*       Scarcity of Water

 

The reasons for the scarcity of water are:

Pattern of Rainfall: The rainfall occurs mainly in rainy season. Therefore, there is scarcity of water in the other seasons.

Loss of Water: All the rain water that falls on the ground cannot be utilized and is lost due to evaporation and runs off the land into streams.

Overuse: Overuse of water is another reason for its scarcity.

Pollution: Pollution of water bodies is one of the main causes of scarcity of water.

Deforestation: Deforestation of hill slopes and other areas leads to excessive runoff of water. In addition to this, negligence and non-proper maintenance of old water tanks, ponds and wells leads to water shortage

 

 

common.jpg  

 

       What is the chemical formula of water?  

(a)

(b)  

(c)

(d)

(e) None of these  

Answer: (b)    

 

 

       In which one of the following states water is present on earth?

 (a) Solid

(b) Liquid

 (c) Gas

(d) All of these

(e) None of these

 

Answer:  (d)

 

 

summary.jpg

Water is a chemical substance with the chemical formula.

A water molecule consists of one oxygen and two hydrogen atoms.

Only 2.5% of the water available on the earth is fresh water.

Approximately 70% of the fresh water used by human beings is for agriculture.

Other Topics



LIMITED OFFER HURRY UP! OFFER AVAILABLE ON ALL MATERIAL TILL TODAY ONLY!

You need to login to perform this action.
You will be redirected in 3 sec spinner

Free
Videos