What common water pollution caused mainly by power plants and factories results in the death of many aquatic organisms? heat oil spills nitrates silt and suspended solids?

The answer to this question is oil spills for they are the usual cause of marine or aquatic organisms to die for there are factories that dump these in water because it is a way for them to expel the oil from the factories because it is much easier than to have or find a more convenient place for them to dump it. This contributes to water pollution, making aquatic organisms to die because of its chemical components.

The study of where things are 

This question has already been answered by someone else.here is a link.  hope that it .