Final answer:
The main uses of aluminum are in construction, transportation, and manufacturing of cans and foil. Aluminum alloys are important due to their enhanced properties compared to pure aluminum.
Step-by-step explanation:
The three main uses of aluminum are in the construction and transportation industries, and in the manufacture of aluminum cans and aluminum foil. These uses depend on the lightness, toughness, and strength of the metal, as well as its resistance to corrosion. Aluminum alloys are important because they possess desirable properties that make them suitable for various applications. For example, aluminum alloys have higher strength than pure aluminum, making them suitable for structural purposes in construction and transportation. They also have excellent conductivity and resistance to corrosion, making them useful in electrical and cooking applications.