Final answer:
In the making of s'mores, conduction occurs as the chocolate melts when in contact with the hot marshmallow, convection is present in the toasting of the marshmallow over the campfire, and radiation comes from the campfire heating the surrounding area.
Step-by-step explanation:
When making traditional s'mores, the three types of heat transfer—conduction, convection, and radiation—occur in distinct parts of the process. Conduction is the heat transfer through direct contact and happens when the marshmallow is placed on the hot graham cracker or comes into direct contact with the chocolate, causing the chocolate to melt. Convection is the heat transfer by fluid movement, which occurs when toasting the marshmallow over the campfire as the heated air circulates around the marshmallow. Finally, radiation is the emission or absorption of energy in the form of electromagnetic waves, which is happening when the heat from the fire radiates out to the surrounding area, including the parts of the s'mores not in direct contact with the fire or each other.