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

G7 Summit: Brexit 'Serious Risk' to Global Economy, Warn Leaders air force black smoke grey South Africa's ANC Suffers Sweeping Election Losses air force black smoke grey African Union Forces Fighting Al-Shabab to Pull Out of Somalia air force black smoke grey ISIS Video Calls on Supporters to Wage Jihad in Russia air force black smoke grey

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