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

New U.K. Prime Minister Theresa May Vows to 'Build a Better Britain' air force black white grey Family of Canadian Murdered by Abu Sayyaf Backs No Ransom policy air force black white grey The Decline and Fall of Dilma Rousseff air force black white grey The ‘Inevitable War’ Between the U.S. and China air force black white grey

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