Earth

A line of equal or constant air temperature is what?

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What is the longest river in Europe?
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According to tradition, what insect in the town of Vermilion predicts the winter weather?
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Which of these is a warm spell of weather when ice and snow melt?
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Which of the following is a renewable resource?
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What word means "the shakes that come after the earthquakes"?
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Which of the following is magnetic?
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How many days a year is the sun invisible at the North Pole?
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Which pairs of minerals are almost always found together?
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