Ключевые слова: bad ecology, chemical, damage, danger, dirty, drain, drainage, drop, ecology, effluent, environment, environmental, environmental pollution, extraction, flow, flowing, impurity, industrial, industry, leak, liquid, mining, nature, pipe, pipe pollutes, pipeline, poison, polluted, pollution, problem, quarry, river, sand, sand equipment, sand mining, sand quarry, sandy, sanitary, sewage, sewer, stream, toxic, tube, waste, waste toxic, waste water, wastewater, water, water pollution, waterfall,