wind - A moving air., breeze - A gentle wind., gale - A very strong wind., windmill - A mill that is powered by the wind., oxygen - A gas that is present in the air which all living things need for breathing., nitrogen - The most abundant gas in the atmosphere., carbon dioxide - A gas needed by plants for photosynthesis., humidity - The amount of water vapour present in the air., dry ice - A solid carbon dioxide is used to store frozen food., fizzy drinks - A sweet non- alcoholic drink with bubbles of carbon dioxide.,

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