CLASS VII GEOGRAPHY CHAPTER 5 WATER

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 Q1. What is precipitation? 

Ans. The sun’s heat vapourises water into vapour. This vapour cools down and condenses to become clouds. This may then fall on the surface of Earth in the form of rain, snow or sleet. This phenomenon of water falling back onto the surface of the earth in the form of rain, snow or sleet is called precipitation. 

Q2. What is the water cycle? 

Ans. The process by which water continually changes its form and circulates between oceans, atmosphere and land is known as the water cycle. 

Q3. What are the factors affecting the height of the waves? 

Ans. The factors affecting the height of the waves are as follows: 1. Speed of the wind 2. earthquake, a volcanic eruption or underwater landslides 

Q4. Which factors affect the movement of ocean water? 

Ans. The factors affecting the movement of ocean water are as follows: 1. Temperature 2. The gravitational pull of sun and moon 3. Warm and cold currents 4. Temperature 

Q5. What are tides and how are they caused? 

Ans. The rhythmic rise and fall of ocean water twice in a day is called a tide. Tides are caused by gravitational force exerted by the sun and the moon on the earth’s surface.

Q6. What are ocean currents? 

Ans. The streams of water flowing constantly on the ocean surface in a definite direction are called ocean currents. The ocean currents may be warm or cold. 

Give reasons. 

(i) Ocean water is salty. 

Ans Ocean water is salty because it contains a large amount of salt dissolved in it. The salt present in ocean water is mostly sodium chloride or the common salt that we eat. 

(ii) The quality of water is deteriorating. 

Ans. The water quality is deteriorating because of human activities like 

a) Deforestation  b) Throwing of garbage and other waste in water bodies c) Chemicals released from industries d) Increased use of fertilisers and pesticides

*Please do the mcq and match the following by yourself*

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