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Question 1.
Answer the following questions.
Answer.
Question 2.
Give reasons.
Answer.
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
Answer.
(a) Water
(ii) Generally the warm ocean currents originate near
(a) Poles
(b) Equator
(c) None of these
Answer.
(b) the Equator.
(iii) The rhythmic rise and fall of ocean water twice in a day is called
(a) Tide
(b) Ocean current
(c) Wave
Answer.
(a) Tide.
Question 4.
Match the following.
(i) Caspian Sea (a) the 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) the 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
Question 5.
For fun.
Be a Detective
(i) The name of one river is hidden in each of the sentences below. Spot it. Example: Mandira, Vijayalakshmi, and Surinder are my best friends
Answer.
Ravi
(a) The snake charmer’s bustee, stables where horses are housed, and the piles of wood, all caught fire accidentally. (Hint: Another name for River Brahmaputra)
(b) The conference manager put pad, material for reading, and a pencil for each participant. (Hint: A distributary on the Ganga-Brahmputra delta)
(c) Either jealousy or anger cause a person’s fall (Hint: Name of juicy fruit!)
(d) Bhavani germinated the seeds in a pot (Hint: Look for her in West Africa)
(e) “I am a zonal champion now” declared the excited athlete. (Hint: The river that has the biggest basin in the world)
(f) The tiffin box rolled down and all the food fell in dusty potholes. (Hint: Rises in India and journeys through Pakistan)
(g) Malini leaned against the pole when she felt that she was going to faint. (Hint: Her delta in Egypt is famous)
(h) Samantha mesmerised everybody with her magic tricks. (Hint: London is situated on her estuary)
(i) “In this neighbourhood, please don’t yell! Owners of these houses like to have peace.” Warned my father when we moved into our new flat.” (Hint: color!)
(j) ‘Write the following words, Marc!’ “On”, “go”, “in”— said the teacher, to the little boy in KG Class. (Hint: Rhymes with ‘bongo’)
Now make some more on your own and ask your classmates to spot the hidden name.-You can do this with any name: that of a lake, mountains, trees, fruits, school items, etc.
Answer.
(a) Teesta (a tributary of Brahmaputra)
(b) Padma
(c) Orange
(d) Niger
(e) Amazon
(f) Indus
(g) the Nile
(h) the Thames
(i) Yellow river
(j) Congo
Do further exercise yourself.
Carry on Detective
(ii) With the help of an atlas, draw each river which you discovered in For fun (/), on an outline map of the world.
Answer.
Question 1.
Why do so many countries face water scarcity? (NCERT Page 32)
Answer.
Due to the following reasons.
Question 2.
Is all water on the earth available to us? (NCERT Page 32)
Answer.
No, only 3% is freshwater. It’s 0.3% is available to us.
Question 3.
Don’t you think we are wasting a precious resource when we use water carelessly? (NCERT Page 32)
Answer.
Yes.
Question 4.
When you are playing throw ball on the beach and the ball falls into the water, what happens? (NCERT Page 34)
Answer.
It goes up and down at its place. It gets back to the shore with the waves.