Potential answers for "Lower layer of the earth's crust"

⭐⭐⭐⭐ SIMA
⭐⭐⭐ SILICON
⭐⭐⭐ PIESHELL
⭐⭐⭐ SIAL
⭐⭐⭐ TECTONICPLATE
⭐⭐⭐ FELDSPAR
⭐⭐⭐ HORST

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