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The pollution caused by the natural erosion or landslides hilly coastal land, the River line moves do gone with mechanical substances such as mud, sand, soil, humus substance ... or due to the eruption of the volcano is made of dust smoke up high as the country bought fell to the ground, or by sea-level rise on the tide depth pollute the rivers , or the high soluble mineral salts concentration is too high, including the carcinogens like Arsenic, Fluorine and heavy metals
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