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 may become hot when exposed to heat?" with the following options: 
- coral
 - gravity
 - the skin
 - sugar
 - density
 - an object
 - copper
 - weathering


 

       copper  