Potential answers for "Stuff below Earth's crust"

⭐⭐⭐⭐ MAGMA
⭐⭐⭐ SILICON
⭐⭐⭐ PIEFILLING
⭐⭐⭐ SIMA
⭐⭐⭐ SIAL
⭐⭐⭐ TECTONICPLATE
⭐⭐⭐ FELDSPAR

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