What Are The Elements
All materials on earth are made up of one or more elements. Elements are substances that have atoms of only one kind. Any one element may have […]
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All materials on earth are made up of one or more elements. Elements are substances that have atoms of only one kind. Any one element may have […]
What Are The Elements Read More »
The flower is the means by which the plant can reproduce new plants like itself. A botanist defines a flower as a group of parts whose function
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The words “perpetual motion” by themselves just mean motion that goes on forever. But usually, when we say perpetual motion we are referring to a very special
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Ice is solid. When the temperature is cold enough, liquid water be- comes into solid ice. Water expands greatly when it freezes. Ten liters of water make
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It is not easy to define what metal is. Physically, metal is a substance that has a bright luster and is a good conductor of heat and
The dust and other materials that are in the air as the result of a nuclear explosion—that is, from atom bombs—is fallout. It contaminates, or poisons, the
Gypsum is used to make wall-board and tiles because it resists fire and water so well and because it insulates a building against both heat and cold.
Millions of years ago, fine-grained clay particles settled on the bottoms of lakes and inland seas and formed a soft mud. This later hardened into the mud-rock
Dust consists of tiny particles of solid matter that can be carried in suspension by air. Dust is usually lifted by the wind from the place it
Many people consider milk to be the most nearly perfect food we have. And when you consider all the good things for your body that you obtain
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carbon is important to all forms of life. It makes up less than 1 percent of all matter, but everything that lives or has lived contains this