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A sonometer is used to compare/measure tuning-fork frequency.
So the correct answer is Sonometer.
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Exam keys often quote about 755 mph for sound in air.
Hence the keyed answer is 755 miles per hour.
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Pulsars are rapidly rotating neutron stars.
Hence the keyed answer is Neutron star.
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The Mariana Trench is the deepest known oceanic trench.
So the correct answer is Mariana Trench.
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That middle layer is the stratosphere.
So the correct answer is Stratosphere.
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Venus's dense COβ atmosphere creates a strong greenhouse effect.
So the correct answer is atmosphere.
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