Earth

What substance, added to fog, makes smog?

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A line of equal or constant air temperature is what?
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Mount St. Helens erupted in what U.S. state?
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What famed rock is 1396 feet high, 2.75 miles long, and .25 miles wide?
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Which age is known as the "Age of Fish"?
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Which of these terms can be used to describe steam?
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Which of these continents would you find in the southern, western hemisphere?
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Which of these is also known as "squawroot"?
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What is another name for the "Humboldt Current"?
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