Science
What kind of power do sailboats use?
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In which constellation was the first double star observed?
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The oldest living tree is 4,843 years old and can be found where?
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What is the repeated sound when sound waves bounce off other objects called?
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A very fast white water cascade is also known as what?
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What is it called when the Earth, Sun and Moon lie in a straight-line configuration?
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The obscuring from sight of one celestial body by another is also by what scientific term?
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What is the name of an instrument that records vibrations in the Earth's crust?
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