Final answer:
Zinc is primarily used in building construction as a coating to protect metal parts from rust and corrosion. Galvanized steel, which is steel with a protective coating of zinc, is commonly used in construction.
Step-by-step explanation:
Zinc is primarily used in building construction as a coating to protect metal parts from rust and corrosion. When iron or other metals are galvanized, they are coated with a layer of zinc. The zinc layer acts as a barrier, preventing air and moisture from coming into contact with the underlying metal and causing corrosion. Galvanized steel, which is steel with a protective coating of zinc, is commonly used in construction due to its corrosion resistance.