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NCERT Solutions for Class 7 Geography Social Science Chapter 5 Water

The Earth's surface is primarily covered by 71 percent water. The water cycle involves a continuous transformation of water, circulating between oceans, the atmosphere, and land. Various freshwater sources include rivers, ponds, springs, and glaciers. Movements within oceans are classified into waves, tides, and currents. These NCERT Solutions for Class 7 Geography offer in-depth, step-by-step explanations, examples, and solutions for all the exercises found in the Geography textbook.

Water

Question 1 :

Answer the following questions.

(i) What is precipitation?

(ii) What is the water cycle?

(iii) What are the factors affecting the height of the waves?

(iv) Which factors affect the movement of ocean water?

(v) What are tides and how are they caused?

(vi) What are ocean currents?

Answer :

(i) The sun’s heat vaporises 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.

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

(iii) The factors affecting the height of the waves are as follows:

  1. Speed of the wind

  2. Earthquake, volcanic eruptions or underwater landslides

(iv) 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. Wind

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

(vi) 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.

 


Question 2 :

Give reasons.

(i) Ocean water is salty.

(ii) The quality of water is deteriorating.

 

Answer :

(i)  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 consume.

(ii)  The water quality is deteriorating because of human activities like

  1. Deforestation

  2. Throwing garbage and other waste in water bodies

  3. Chemicals released from industries

  4. Increased use of fertilisers and pesticides

 


Question 3 :

Tick the correct answer.

(i) The process by which water continually changes its form and circulates between oceans, atmosphere and land

    (a) Water cycle

    (b) Tides

    (c) Ocean currents

(ii) Generally, the warm ocean currents originate near

   (a) Poles

   (b) Equator

   (c) None of these

(iii) The rhythmic rise and fall of ocean water twice in a day is called

   (a) Tide

   (b) Ocean current

   (c) Wave

 

Answer :

(i) a

 

(ii) b

 

(iii) a

 

 


Question 4 :

Match the following.

(i) Caspian Sea

(a) Largest lake

(ii) Tide

(b) Periodic rise and fall of water

(iii) Tsunami

(c) Strong seismic waves

(iv) Ocean currents

(d) Streams of water moving along definite paths

 

(e) Water cycle

 

Answer :

(i) Caspian Sea

(a) Largest lake

(ii) Tide

(b) Periodic rise and fall of water

(iii) Tsunami

(c) Strong seismic waves

(iv) Ocean currents

(d) Streams of water moving along definite paths

 


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