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Plaster of Paris Secure some plaster of Paris and mix a small amount with water. It must be worked quickly or it will harden whereas being mixed. Place the mixture in moulds an
Definition of a rock and the difference between a rock and a mineral ? A rock is a mixture of one or more minerals. There are many kinds of rocks, and we will learn about them
What is an ionic bond? By definition, an ionic bond is a chemical bond that forms between two or more oppositely charged ions. The animation above shows an ionic bond between a
true or false? water conservation efforts have been wholly inaffective
Tuning in on the Stars: The fact that stars emit radiowaves was discovered accidentally in 1932 by a young engineer Karl Jansky. He was trying to find the source of noise
What is happening to the length of a day on the Earth, as a result of the gravitational pull of the Moon?
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
what is meaning of solid'' liguid'' gases?why eresers float in water?why deos paper sink in water?
what is chemical reation
Stellar Parallax If the Earth were stationary, a given line joining point A on the Earth, a nearby star C and any given distant star would never vary. However, if the Earth
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