Earth

What instrument measures altitude?

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What is the hardest mineral known on Earth called?
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How much salt is in every gallon of seawater?
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Advection, freezing and radiation are types of what weather phenomenon?
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Which star is the closest one to Earth?
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What is the most common element in Earth's atmosphere?
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What famous volcano erupted in 1980 after many years of dormancy?
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The average rain drop falls at a rate of how many feet per second?
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