Earth

What substance, added to fog, makes smog?

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Where in Arizona is the sun blocked 10% of the time?
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Which of the following is not a major component of an ecosystem?
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What forms when water condenses in the Earth's atmosphere?
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What is the nickname of Katmai in Alaska?
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What season has the warmest weather in the U.S.?
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What is another name for fossilized resin?
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What is the name of any body of igneous rock named for the Roman god of the underworld?
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What is the most-spoken language in the world?
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