Earth

What substance, added to fog, makes smog?

More Questions from Earth
In what month does the vernal equinox take place in the northern hemisphere?
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Which of these is also known as "squawroot"?
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Which of these rivers flows north?
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What does granite become when put under heat and pressure?
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What might you find on the grass after a cool summer night?
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What is the hardest mineral known on Earth called?
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What is America's federal weather agency called?
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In weather, "mean" means what?
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