If the air surrounding the skin is still (no wind) and higher than 37 C (98.6 F), how much heat is likely to be radiated away from the skin (none, a little, or a lot)

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.