Someone left a plastic bag into the river for an extended period. Plastic bags covered the light from the Sun causes the river lacking oxygen. The fish in the River does not receive oxygen for breathing, dying fish has resulted in water pollution.
Plastic bags dumped into the river for a long time. Plastic shade from the sun, making the lack of oxygen. Fish in the river does not get oxygen to breathe, the fish die, resulting in water pollution.
People throw away plastic bags into the river for a long period of time.). Plastic cover of light from the sun makes the river lack of oxygen.). The fish in the river did not get oxygen breathing fish died cause water pollution.