oxygen - formed by burning of fuel, smoke - condenses into tiny droplets, ozone - lake, carbon dioxide - potential energy, plants - light energy, rain water - solar energy to heat energy, ear - layer of gas, sea water - supports combustion , nitrogen - natural spring, water vapour - does not support combustion, eyes - transpiration, ground water - saline, skin - sound energy, solar cooker - purest water, surface water - heat and wind energy, tongue - fertilizer,

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