What are three common combustible metals?

The selection of Aluminum, Magnesium, and Titanium is correct as these three metals are commonly recognized as combustible metals due to their increasing reactivity when in fine powder form or shavings.

Aluminum, while widely used in many applications, can burn if exposed to a flame or high heat, especially in the form of thin sheets or fine particulates. Magnesium is notably flammable and can ignite in air, producing intense brightness when burned, which makes it a critical consideration in safety practices. Titanium, although considered more stable than the other two, can still undergo combustion under specific conditions, particularly when finely powdered or as thin shavings.

These combustible metals must be handled with care, as they pose a risk of fire and explosion in work environments where they are machined, cut, or produced in powder form. Understanding the combustible nature of these metals is essential for implementing proper safety measures and responding effectively to potential fires.

In contrast, the other combinations include metals that either do not pose the same level of combustibility or are more commonly associated with different hazards than combustion.