River with a Problem

अपनी भाषा में प्लॉट जोड़ेंWater pollution film, using the Ottawa River as an example of what happens when a river is used as a dumping place for municipal and industrial waste. Color animation illustrates exactly wha... सभी पढ़ेंWater pollution film, using the Ottawa River as an example of what happens when a river is used as a dumping place for municipal and industrial waste. Color animation illustrates exactly what happens to river water as it becomes polluted.Water pollution film, using the Ottawa River as an example of what happens when a river is used as a dumping place for municipal and industrial waste. Color animation illustrates exactly what happens to river water as it becomes polluted.