Ключевые слова: background, barrel, beach, big, black, chemical, chemistry, color, concept, container, danger, dirty, ecology, environment, factory, fossil, fuel, gallon, garbage, gas, gasoline, global, industrial, industry, junk, leak, leaking, metal, naphtha, natural, nature, oil, outdoors, petrol, petroleum, pollution, problem, river, safety, sand, stained, toxic, waste, water,