Gap Fill - Cold Air - Level 4


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   air      areas      atmosphere      basic      effect      lightness      particles      researcher      study      warming  

Paragraph 1

We learn that warm rises and cool air sinks. This is science. A new found circumstances in which cool air rises in tropical . Cold air rises because of the of water vapour. In humid climates, water become lighter and help cool air rise. A said: "Water vapour has a buoyancy which helps release the heat of the to space and reduce the degree of ."

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