Final answer:
Heat transferred through the copper rod from the flame of a Bunsen burner that causes wax to melt is an example of conduction, which is the transfer of heat through physical contact in stationary matter.
Step-by-step explanation:
When one end of a copper rod is placed in the flame of a Bunsen burner and small pieces of wax melt at progressively larger distances from the flame, this demonstrates heat transfer through the rod by conduction. Conduction is the transfer of heat through stationary matter by physical contact, as opposed to convection which involves the movement of a fluid, or radiation which involves electromagnetic waves. In the given scenario, the heat from the flame is conducted through the copper rod, causing the wax to melt as the rod heats up along its length.