Category : 7th Class
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
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)
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.
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