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Cement and concrete
Secure a small bag of Portland cement. Have the pupils mix it with water and put it in tin can covers, paper cups, or small pasteboard boxes unless it hardens. Study its appearance and its properties. Break a piece of cement and study it. Mix the dry cement with about twice as much sand or gravel. This will form concrete. After adding water and mixing thoroughly place it in moulds. Permit these to arden various days. Again study the appearance and the characteristics of these samples.
explain the encryption model
A rain gauge Mount your wind speed indicator in a place that is exposed to the wind from all directions. 4 A rain gauge It is simple to make a easy rain gauge using a funnel an
AIDS: You have learnt about infectious diseases. For centuries, death from infectious diseases was common and whole populations were often affected. One of the remarkable achi
Pollution due to Noise: Sound is an important means of communication, but high levels of noise could damage hearing, and cause deterioration in capacity to concentrate on
discussion about mucic acid test
What is Topography The location of a soil on a landscape i.e., topography or relief of the land is an important passive factor in soil formation as it can affect the impact of
100 words
What is Tongue? The tongue is a major organ. You will agree that the tongue precisely reflects the state of our digestive system. How? Well, you may have experienced that occas
Water Pollution Pollution of fresh water is one of the most serious environmental problems of the world as a whole. In our country most of the rivers and lakes are polluted
Q.How is soil formed? Soil is formed by breaking down of rocks at or near the surface of the Earth through various physical, chemical, and biological processes by various factor
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