Earth

What word is generally used to describe visible air pollution?

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What is the name for snow crystals that melt and refreeze into granular particles on glaciers?
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What is hail made of?
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Ruby and sapphire are gem forms of which mineral?
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What is sedimentary rock composed primarily of sand-sized grains?
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What is the nickname of Katmai in Alaska?
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What is the tendency of Earth's rotation to turn winds called?
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What is the trapping of the sun's solar energy and radiation called?
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