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Classical element - Wikipedia
The Four Elements of Matter: Earth, Water, Air, Fire
Understanding the Elements of Nature - Nature Calms You
Earth, Air, Fire, and Water: Empedocles of Acragas - Ancient …
Earth (classical element) - Wikipedia
What Are the 5 Traditional Elements? - ThoughtCo
Empedocles and the Four Classical Elements: Air, Water
The four fundamental forces of nature - Live Science
The four fundamental forces of nature - Space.com
SCIplanet - The Origins of the Four Elements: Earth and Water