Science
Where is the observatory where Percival Lowell first theorized the existence of Pluto?
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What Swedish physicist and astronomer influenced the foundation for the light spectrum analysis?
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The leading edge of an advancing cold air mass is known as what?
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What is the ripened ovary of a flower better known as?
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What are plants that need two years to complete its life cycle?
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What are the first four planets in the solar system called?
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What does one call a smaller stream that parallels a larger stream and finally enters the larger stream?
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