4th EVS NCERT Chapter 13
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– How waves move in the sea
– Drinkability of sea water
– Changes in rivers, ponds, or streams throughout the year
– Differences in water levels between rainy season and summer
– Water pollution from human activities such as washing clothes and cleaning utensils
– Effects of different substances on water and water purification methods
– Causes and consequences of floods
– Identification of dirty water and the importance of clean water for drinking【4:0†source】【4:1†source】【4:2†source】
What is the colour of the river where it begins?
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At some places, there are many fish in the river, at others, there are only a few and at some places there are dead fish. What could be the reason for this? Discuss.
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What can be seen in the river before it reaches the village?
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At which places did the colour of the water in the river change? Why did this happen? Discuss.
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Will there be the same amount of water in the ponds or rivers during the rainy season and in summer?
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