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Classification of Fires As explained also. We can say that the four main sources of fire risk in the science laboratory are: i) flammable substances, ii) compressed and
What is coal? The remains of trees and shrubs grew millions of years ago, when the weather was mild and moist.
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 harde
A bottle barometer A bottle, partially filled with water, is overturned with its neck under the surface of more water in a saucer. This is the device used as a chicken feeder,
Artificial Satellites Tireless Servants in the Sky The space crafts that move in an orbit around the earth are called artificial satellites. Most satellites go around the
Hypothesis: The next step is to formulate hypothesis. A hypothesis is a statement, put forward on the basis of reasoning, about the things that are being studied. It is an att
Why marbles rarely contain fossils
what is diffusion.
When, in the geologic column, did dinosaurs become extinct at the Cretaceous-Tertiary boundary
Navigation and Astronomy: As we have said earlier, by the edd of the Middle Ages, trade on land and over the seas was being Sken up on a big scale. By the fifteenth centur
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