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Clouds and fog

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
an airplane's artificial clouds   contrail  
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name that means "heaps of curls"   cirrocumulus  
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name that means "to extend" or "to stretch"   stratus  
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white and billowy cloud that resembles a pile of cotton balls   cumulus  
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the most common type of high-level cloud   cirrus  
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lens-shaped clouds   lenticular  
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thunderstorm cloud   cumulonimbus  
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fog that forms when a warm, humid breeze blows over a cold surface   advection  
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fog that forms when the ground cools at night while the air is still moist   radiation fog  
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a thick, brownish haze that results from complex molecules released into the air by vehicles   photochemical smog  
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