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from lifewithmoorebabies.blogspot.com

What Causes a Thunderstorm?

What Causes a Thunderstorm? A cold air front runs into a warm air front forcing it to go up and causing unstable air. This experiment uses colored water to represent the warm and cold air masses.

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Air France Paris London Valerio, 1938 - original vintage poster by Roger de Valerio listed on AntikBar.co.uk

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from The Travel Gear Reviews

57 Amazing African Vintage Travel Posters

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