Fact 1: If a thermal conductor is exposed to a source of heat then that conductor may become hot.

Fact 2: Copper is a great thermal conductor.

Given the two facts above, answer the question "what happens to copper if exposed to heat?" with the following options: 
- contamination
 - produces electricity
 - It expands
 - becomes hot
 - they bend
 - becomes cold
 - vibrates
 - anemia


 

    becomes hot     