VI. Choose the word in the box to complete the text.
|
aquatic |
accumulated |
catchment |
pollutants |
sustain |
|
containing |
discharged |
rubbish |
channels |
insecticides |
RIVER POLLUTION
River pollution occurs when (1) __________________ are not removed from sewage and are discharged into the river. River water is a very important source of freshwater required to (2) ____________________ life. We need a constant supply of fresh water for drinking, cooking and washing. Animals living near the river, as well as fishes and (3) ______________________ plants, also depend on clean river water.
When heavy rainfall occurs, pollutants (4) ______________________ within the boundaries of the (5) ____________________ area may be washed into river (6) ____________________. These pollutants include a variety of agrochemicals like fertilizers and (7) ______________________.
Waste water (8) ______________________ cleaning detergents, oil and other pollutants like industrial waste may be (9) ________________________ into the river channel through our drainage systems. Industrial waste may contain sulfur, resulting increasing the acidity of the river water. Sometimes, (10) _______________ such as plastic bags and bottles, are washed into the river channel.
