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Air (classical element) - Wikipedia
The Chemical Composition of Air - ThoughtCo
Classical element - Wikipedia
Air | Composition, Oxygen, Nitrogen | Britannica
Components of Air - Oxygen, Nitrogen, Carbon dioxide, Water …
The Four Elements of Matter: Earth, Water, Air, Fire
Chemical Composition of Air - Science Notes and Projects
Composition of Air
Air Element in Astrology Meaning and Characteristics
Air - National Geographic Society