Question

Paheli is worried. She could see a brick kiln from her house. Bricks were being made there. There was so much smoke coming out of the kiln. She was told that the best quality of clay is required for making pottery, statues and bricks. She has seen truck loads of bricks being taken away for construction of buildings. At this rate, she fears, no soil will be left. Are her fears justified? Discuss this problem with your parents, teachers and other excepts of your area and prepare a report. One method is given here . Activity :Take 100g soil. (Take help from any shopkeeper to weigh the soil.)place it on a newspaper in the sun and allow it to dry for two hours. This activity is best done in the afternoon. Take care that the soil does not spill outside the newspaper. After drying it, weigh the soil again. The difference in the weight of the soil before and after drying gives you the amount of moisture contained in 100g of soil. This is called the percentage moisture content. Supposedly your sample of soil loses 10g on drying. Then per cent of moisture in soil =wt.of moisture (g)/original wt.of soil sample (g)×100 In this example per cent of moisture in soil =10×100/100=10%

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This is Ncert book question na of paheli and bhojo