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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.
Oxidising Substances : It includes oxidising substances and the organic peroxides. Oxidising substances are by themselves not combustible but by feeding oxygen to other substances
Food Web: Within an ecosystem, there are many different food chains. Some organisms may be involved in several of the food chains at the same time. So a number of food chains
information about the eyes
Explain Sinus Arrhythmia - electrocardiogram In few adults and most children, there is raise in heart rate during inspiration and a decrease during expiration. This rhythm is m
A model illustrating how an eclipse appears The sun is shown by an opal electric bulb shining by a circular hole 5 cm in diameter in a piece of blackened cardboard. The corona
This mineral has the name "bloodstone" because it provides a deep red color on a streak test. What is its chemical formula? Fe 2 O 3
FIRST AID PROCEDURE FOR ELECTRIC SHOCK : Although the procedure described is usually followed, there are occasions when other matters have to be considered and therefore the proce
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Define the term - Irrigation Irrigation may be defined as the process of artificially supplying water to soil for full-fledged nourishment of the crops." In other words, it is
Define Hypothalamic Control of Anterior Pituitary Gland The hypothalamus controls many of the automatic functions of the body. It secretes a series of different neurosecretory
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