gemstone, A hard, colorful mineral that has a brilliant or glassy luster and is valued for its appearance., ore, Rock that contains a metal or economically useful mineral., smelting, The process by which ore is melted to separate the useful metal from other elements., alloy, A solid mixture of two or more elements, at least one of which is a metal.

Chapter 3.3

بواسطة
طباعة
تضمين

لوحة الصدارة

النمط البصري

الخيارات

تبديل القالب

استعادة الحفظ التلقائي: ؟