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Water
Give reasons.
(i) Ocean water is salty.
(ii) The quality of water is deteriorating.
(i) The ocean bodies and the seas contain salty water. The water of oceans is salty or saline as it contains large amount of dissolved salts. Most of this salt is sodium chloride.
(ii)Though three-fourth of the Earth’s surface is covered with water, almost 98% of it is unfit for use. Oceans and seas, which constitute the major portion of the hydrosphere, contain saline water. The fresh water reserves of the Earth are mostly made up of ice-caps, ground water, lakes and rivers. The quantity of water on Earth remains the same. It constantly changes form and circulates between oceans, atmosphere and land. Considering that the fresh water reserves remain constant and that the world population rises day-by-day, it is important that we use these water resources judiciously. However, due to factors like deforestation, industrial and agricultural pollution of rivers and lakes, wastage of water, pollution of ground water, etc., the quality of water that is available to many people in this world today is not suitable for human consumption.
Some More Questions From Water Chapter
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 |
For fun.
Be a Detective
(i) The name of one river is hidden in each of the sentences below. Spot it.
Example: Mandra, 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. (Hint: A distributary on the Ganga−Brahmputra delta)
(c) Either jealousy or anger cause a person’s fall. (Hint: Name of a 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: colour!)
(j) ‘Write the following words, Marc!’ “On”, “go”, “in”…….. said the teacher to the little boy in KG Class. (Hint: Rhymes with ‘bongo’)
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Mock Test Series
Mock Test Series