Ключевые слова: abstract, background, bad ecology, bubble, canal, contaminated, contamination, damage, danger, dirt, dirty, dramatic, ecology, environment, environmental, environmental protection, floating, flowing, foam, green, grunge, industrial, industry, liquid, nature, outdoor, pattern, pollutant, polluted, pollution, pond, problem, river, soap, stream, substance, surface, texture, textured, toxic, unhygienic, waste, water,