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Question
Answer the following question:
Which factors affect the movement of ocean water?
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Solution
The movements that occur in oceans are broadly categorised as waves, tides, and currents.
The factors affecting these movements of ocean water are as follows:
(a) Waves are formed as a result of winds, earthquakes, volcanic eruptions, and underwater landslides.
(b) Tides are caused by the strong gravitational pull exerted by the Sun and the Moon on the Earth’s surface.
(c) Another factor affecting the movement of ocean water is temperature. Ocean currents are formed because of the temperature differences between the ocean water present at different latitudes.
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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 Brahmputra)
(b) The conference manager put pad, material for reading and a pencil for each participant.
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(c) Either jealousy or anger causes a person’s fall
(Hint: Name of juicy fruit!)
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(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: colour!)
(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.
Carry on Detective
(ii) With the help of an atlas, draw each river which you discoverd in For fun (i), on an outline map of the world.
Very Short Answer Type Question:
What is Tsunami?
Very Short Answer Type Question:
What happens during high Ode?
Very Short Answer Type Question:
What happens during low tide?
Short Answer Type Question:
How are high tides important?
What are waves? Write a short note on it.
Long Answer Type Question:
How do we classify ocean movements? Explain.
