SolidIce (frozen water)Iron (metal used in construction)Wood (material from trees)LiquidWater (H₂O in liquid form)Milk (common dairy product)Oil (like cooking oil)GasOxygen (O₂, vital for breathing)Carbon dioxide (CO₂, exhaled by humans)Helium (used in balloons)Plasma (less common but fascinating)Lightning (natural plasma)Neon (in neon signs)Stars (like the Sun, composed of plasma)