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Drinking straw hydrometer
Procure a drinking straw or a stout natural straw about 20 cm long. If it is not 'water-proof' dip it in melted candle wax and permit it to dry. Seal one end with wax, and introduce some lead shot or fine sand unless it floats in a vertical position. Then drop in melted wax to keep the shots or sand in place. Have a thin rubber band or a piece of black cotton tied round the stem so that it can be slid up and down as a marker.
Obesity - Choose one macronutrient (carbohydrates) and one micronutrient (vitamins) that have some relationship to the disease. Conduct a brief web search to learn about the ro
What is the function of the pharynx of a planarian?
Fire Barriers : When a fire starts in a building it spreads quickly by: a) Radiation - Intense heat radiates to neighbouring surfaces which are rapidly heated to ignition poi
about juxta glomerular appartus
What is the earths core made of? Ans) The outer earth core is liquid and the inner is solid. Both parts are of alloy of two metals - iron and nickel, permitting the rise of the
To show the differences in soil particles Secure some glass jars that hold about half Gallon or two litres of water. Place various handfuls of soil in a jar. Fill the jar with
Demonstrating an eclipse of the moon Use a flash light or a lighted candle in a darkened room to show the sun. Hold an 8 cm rubber ball in one hand to show the earth. Hold a 2-
Explain how EMR waves are transverse?
What are famous life scientist and what did they discover?
How do minerals become rocks and rocks become soil? Ans) Minerals become rocks by pressure and temperature, often deep inside the earth's core, or easily through pressure for i
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