Earth
What instrument measures altitude?
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What process carries minerals down into lower soil horizons?
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What word means "the shakes that come after the earthquakes"?
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What did ancient farmers probably use to tell the passing of seasons?
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What chamber do divers go into to prevent a diving sickness called "the bends"?
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There are over one quadrillion of what animal on Earth?
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What natural disaster is caused by earthquakes but could also be caused by an asteroid?
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What is a plant with no internal system of tube like structures called?
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What is a tornado that doesn't reach the ground called?
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