This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
1) oil spilage
2) domestic sewage

1) one should not dispose tdomestic wastes in open water or land
2) one should not wash animals in rivers or wash clothes in river or water sources
4 2 4