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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 Yawing Reflex Actions - Respiratory Pocess Yawning: It is a deep inspiration drawn through open mouth. Low oxygen tension in the blood may be the cause of yawning.
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Nutrient groups and their functions: We should know that our body is made up of different chemical substances which are related to the food we take. Scientists have determine
Coenzyme : A molecule that binds to an enzyme and is essential for its activity, but is not permanently altered by the reaction. Many coenzymes are derived from vitami
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Cosmic Distances: If we asked you what the distance between Delhi and Kanyakumari is, you would say that it is roughly 3000 km. Another way of answering the question would
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