Is due to the rain, snow melt, flooding, wind storm ... or the active product living of creatures, including the corpses of them. Trees, creatures die, they are microorganisms that decompose the organic matter. The part will infuse into the ground, then eat deeply into groundwater, polluting the groundwater into streams or large stream. Floods could make the country lose the clean, stirring up the mess in the sewers, carrying many of the toxic waste from the garbage place and according to the types of chemicals stored previously.
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