📅 NSB 2012🎓 HS🔄 Round 2#️⃣ Q18🌟 BONUS✍️ Short Answer
Igneous [IG-nee-uhs] rocks and magmas are classified into four main compositional groups: ultramafic, mafic, intermediate, and felsic, based on the content of what chemical compound?
✔️Answer:SILICA
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