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  1. Abundance of elements in Earth's crust - Wikipedia

  2. Chemical Composition of the Earth's Crust - Elements - ThoughtCo

  3. Composition of the crust - Chemical elements, Minerals, Rocks

  4. 1.1: Composition and Structure of the Earth - Chemistry LibreTexts

  5. What Is The Earth Made Of? - WorldAtlas

  6. 5.3: The Composition and Structure of Earth

  7. Earth's Composition | Layers + Structure + Chemical Make-Up

  8. What is Earth Made Of? - Planet Facts

  9. Earth's Layers, Structure of Earth Interior: Core, Mantle, Crust

  10. What Four Elements Make Up Almost 90% Of The Earth?