Science

How many major time zones does the earth have?

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What is a process used by plants to convert light energy into chemical energy?
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The science term "precipitation" is best defined as which of these?
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How long, in kilometers, is the average single thread unwound from a silkworm cocoon?
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What is a spacecraft that orbits planets, moons or other large space objects called?
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Where on the moon did people first land a spacecraft?
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What is the largest known land animal?
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What is Jupiter mostly made of?
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About how often does Halley's Comet return?
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