Ключевые слова: barrel, blue, chemical, chemistry, city, color, colorful, container, crisis, danger, dirty, disaster, drum, ecology, empty, energy, environment, factory, fuel, gallon, garbage, gas, grunge, hazard, industrial, industry, metal, oil, outdoors, outside, park, pollute, pollution, power, recycle, recycling, red, rubbish, rust, rusty, safety, steel, storage, symbol, tank, toxic, urban, waste, white,