Ключевые слова: active, alert, apocalypse, area, asphalt, atom, atomic, attack, attention, background, black, bomb, caution, chemistry, contamination, danger, dangerous, dirty, disaster, energy, grunge, hazard, hazardous, icon, illustration, industry, metal, nuclear, pollution, power, protection, radiation, radioactive, radioactivity, ray, reactor, restricted, risk, road, safety, science, shoe, sign, symbol, texture, toxic, uranium, warning, waste, yellow,