What Makes People from Different Parts of the World Have Different Skin Colors? People noticed long ago that people from different parts of the world often had...
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Why Do Dogs Moult? Dogs normally moult every year in late spring. As the weather becomes warmer the dog’s body temperature is naturally kept down by the process...
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People with gray or white hair didn’t always have hair that color. Their hair may once have been black or brown, light blond or flaming red. Your hair grows from...
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What Makes the Wind Blow? Wind is air in motion. Wind is caused mainly by the uneven heating of the air around the earth by the sun. Since the earth’s surface is made...
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Ice is able to float because it is lighter than water. Water greatly expands as it freezes into ice. Ten quarts of water produce about eleven quarts of ice. Thus, ice...
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