Science

What is the perception of frequency called?

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What liquid is used as a standard when measuring density?
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Colors other than white, black and the pure greys are known as what?
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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 tough outer layer of a seed called?
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What sort of electricity do you get when you rub two balloons and they stick together?
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What is matter that allows light to pass through called?
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Which of the following is a type of cloud?
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