Heavy objects are primarily composed of which materials?

The correct answer is the combination of Iron and Steel, as they are well known for their density and strength, making them the primary materials used in constructing heavy objects. Iron, in its natural form, is a heavy metal, and when alloyed with carbon to create steel, it significantly enhances durability and load-bearing capabilities.

Steel is extensively utilized in various heavy applications such as construction, manufacturing of machinery, and transportation due to its high tensile strength. The combination of these materials provides the necessary structural integrity for tasks that require heavy lifting or support.

While other materials like Aluminum and Plastic can also be used in various applications, they are generally lighter and not suited for heavy objects where strength is a key factor. Similarly, Copper and Brass, although they have their own advantages like conductivity and corrosion resistance, are not primarily associated with heavy structural applications. Cement and Wood can be heavy but are not typically categorized in the same way as Iron and Steel when considering overall strength and mass for heavy object fabrication.