Final answer:
Metal roofs are best protected by properly maintaining them with paint.
Step-by-step explanation:
One way to prevent corrosion is by protecting the surface of metal. Metal roofs can be best protected by properly maintaining them with paint. By covering the surface of the metal roof with paint, it prevents corrosion by not allowing oxygen to contact it. The paint acts as a barrier between the metal surface and the elements that cause corrosion. However, it is important to regularly maintain the paint by repainting when necessary to ensure continued protection.