Answer :
Final answer:
Convection and radiation are two heat transfer methods directed upslope in steep terrain that preheat fuels and increase the rate of spread.
Explanation:
Heat transfer in steep terrain directed upslope, which allows fuels to preheat and increases the rate of spread, is primarily facilitated by two methods: convection and radiation. Therefore, the correct answer to the schoolwork question is C) Radiation; convection. Radiation is the transfer of heat through electromagnetic waves, and it does not require a medium. This means that it can heat the fuel ahead of the actual fire. Convection, on the other hand, is the transfer of heat by the movement of heated fluid which includes gases. In the context of a fire spreading uphill, the hot air and gases will rise due to their lower density compared to the cool air, preheating the fuel above the fire.
