Earth

What substance, added to fog, makes smog?

More Questions from Earth
What is a tornado that doesn't reach the ground called?
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Weather radar that measures direction and speed of a moving object best fits which science term?
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Which of the following is a nonrenewable resource?
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What type of rock is coal?
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Which word means to "filter down through the soil horizons"?
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Al Gore made a film about what climate issue?
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What is the name of the single continent that existed early in Earth's history?
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On October 11, 1999 the world population hit a milestone of how many?
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