Here's a breakdown of the top 4:

1. Iron: Used in steel, cast iron, and other applications.

2. Aluminum: Used in packaging, construction, transportation, and more.

3. Copper: Used in electrical wiring, plumbing, and other applications.

4. Aluminum: Widely used in various industries due to its light weight, corrosion resistance, and recyclability.

Let me know if you'd like to explore the uses of other metals!