Which element is most abundant in Earth’s crust? By Kalsoom Tahir 🌐 Source Science & Technology Archive ✅ Fact Checked 📊 Difficulty Medium 📅 Last Updated 13 Aug 2026 A. Iron B. Silicon C. Oxygen D. Aluminum Check Answer 💡 Explanation: Oxygen makes up nearly half of the Earth's crust by mass. 📚 Topics: Earth Science Science 🎯 Exams: CSS GEN NTS PMS