Science
What is a steep-sided circular depression commonly known as?
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What are plants that grow, flower, make seeds and die in one year?
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Which is the planet with the greatest average density?
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What spacecraft takes astronauts into space, orbits the Earth and can be flown more than once?
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After the Centauri system, what is the next farthest star from our sun?
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Which of the following books has Carl Sagan not authored?
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During the seventeen hundreds, what creature was thought to excrete blood through its skin?
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