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Convection process diagram. Warm air rises and cool air sinks. Hot and cooler air masses.Cloud

Fallujah: Progress Against ISIS Reignites Hope for Relatives and Survivors of Iraq War air force 1 atmosphere grey Putin Forms Specialist Team to 'Brainstorm' Economic Growth air force 1 atmosphere grey Watch: Aleppo Residents Burn Tires to Obscure Assad and Russian Warplanes air force 1 atmosphere grey Brexit: Vodafone Could Move Thousands of Jobs Out of U.K. air force 1 atmosphere grey

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