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Classical element - Wikipedia
The Four Elements of Matter: Earth, Water, Air, Fire
What are the Naturally Occurring Elements? Elements Found In Nature
Aether (classical element) - Wikipedia
What Are the 5 Traditional Elements? - ThoughtCo
2.1 Elements and Atoms: The Building Blocks of Matter
Chemical element | Definition, Origins, Distribution, & Facts
Nature - Wikipedia
Understanding the Elements of Nature - Nature Calms You
Elements of Nature | Definition & List - Lesson - Study.com