Ключевые слова: aqua, biology, blue, boulder, bushes, careless, chemicals, clear, contaminated, danger, death, destruction, dirt, dirty, disaster, disposal, dumping, ecology, effect, effluent, environment, flow, grass, green, harmful, industrial, landscape, metal, mine, nature, orange, plant, poison, poisonous, polluted, polluting, pollution, river, rock, sewage, sky, slime, slimy, stream, toxic, trash, treatment, waste, water, yellow,