JBL Hazardous Materials Practice Test

Ears and nose are most susceptible because they are highly exposed to the environment and have thin skin with little protective fat or muscle. Their protruding shape means they encounter wind, sun, and cold directly, leading to rapid heat loss in cold conditions (frostbite risk) and easy sunburn or heat exposure in hot conditions. The skin on these areas is relatively delicate and tightly bound to underlying cartilage, which offers little insulation, so temperature changes affect them quickly. In contrast, hands and feet, while vulnerable, are often insulated by gloves and footwear; eyes have protective eyelids and sockets, and shoulders are less exposed to direct temperature extremes.