When Does Coal Become a Precious Stone?
Coal is basically a compound consisting largely of carbon. When a piece of carbon deep underground is subjected to great heat and pressure, it may gradually be...
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Where Does Coal Come From?
Coal comes from the remains of trees, shrubs, and plants that grew millions of years ago, in tropical wetlands, such as those of the late Carboniferous period (the...
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How Do Trains Work?
How Do Trains Work? Long before automobiles took to the roads and airplanes flew into the skies, people rode horses to get from one place to another quickly. Horses...
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How Is Coal Formed?
How Is Coal Formed? Coal comes from plants that have been buried in the earth so long, they turned hard and black. Millions of years ago, much of the earth was swampy...
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How Did Ponies Get Their Name?
How Did Ponies Get Their Name? The word pony started as the Latin word pullus, which meant “a young animal.” Then the word passed into French as poulenet, meaning “a...
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