False : sea water cannot be used for irrigation as such.

True

False : The evaporation of water takes place in any source of heat.

True

False : Water present in rivers, lakes and ponds is fit for use by human beings.

Floating layer of ice acts as a protective coat and does not permit heat to escape from water. So aquatic animals manage to live in Arctic and Antarctic circle.

polar ice - gaps, glaciers and ice sheets in Arctic region and Antarctica.

When the air around the clouds is cool then only it will rain. That is the reason why it doesn't rain daily.

people get water from, canals, rivers, wells, ponds, water tanks, hand pipes for various purposes.

wells, glaciers, rivers, lakes, ponds, etc.

(i) Sewage should not be disposed off in rivers or oceans before treatment.
(ii) If we dispose sewage water before treatment the river and oceans will be polluted.
(iii) We can not use the river water for our day to day life.
(iv) Aquatic animals and species will die due to pollution.

71% of earth's surface is covered with water. The fresh water is only 3%. It remains the same, But the water needed for plants, animals and man is increasing day by day. So we face water scarcity.

(i) "To a thirsty man, a drop of water is worth more than a sack of gold".
(ii) "Water covers 2/3 of the surface of the earth. But only 0.002% is drinkable".
(iii) "Save water to secure for your future".
(iv) "Store water for dry days".
(v) "Save water, Save life".

(i) Direct collection and use of rain water is called rainwater harvesting.
(ii) Excellent and valuable source of water in emergencies.
(iii) Ideal solution for inadequancy of water.
(iv) Increase ground water level.
(v) Reduces rainwater run off and solves drainage problems in houses.

(i) Dr. Rajendra Singh is known as "Waterman of India".
(ii) He is a well - known water conservationist and environmentalist.
(iii) His team built rainwater storage tanks, check dams and other timetested as well as path - breaking techniques.
(iv) His team built over 8600 johads to collect rain water for all seasons. It has brought water back to over 1000 villages and revived five rivers in Rajasthan.
Awards:
(i) He won stockholm water prize in 2005, an award known as "The Noble Prize for water".
(ii) Ramon Magsaysay Award in 2001.
(iii) Jamnalal Bajaj Award in 2005.

(i) Potable water is the water which is safe to drink. On an average the human body requires 2-3 liters of water per day for proper functioning.
(ii) It is transparent.
(iii) It is odourless and colourless.
(iv) Cleaned of harmful contaminants.
(v) It is harmless or free from disease causing bacteria.

When we breathe out, the hot air comes out from our mouth which condenses and gets changed into tiny water droplets and hence the glasses become wet.