Earth

Which is heavier, cold air or warm air?

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What fuel comes from the remains of 300-million-year-old decayed fern plants?
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Which age is known as the "Age of Fish"?
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The Hawaiian Islands are a good example of which type of volcano?
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Which of these is another name for dirt?
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According to the International Flat Earth Society, where is the hub of the world?
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How many geysers is Yellowstone National Park home to?
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On which canal would a traveler find Port Said?
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What is another name for green beryl?
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