Industries produce waste that can affect the: 1  pH of water (whether it is acid, neutral or alkaline); 2  colour of water; 3  amount of nutrients (increase in nutrients can cause eutrophication);
Generally, the purpose of a review is to analyze critically a segment of a published body of knowledge through summary, classification, and comparison of prior research studies, reviews of literature, and theoretical articles.
The purpose of a summary is to give the reader, in a about 1/3 of the original length of an article/lecture, a clear, objective picture of the original lecture or text. Most importantly, the summary restates only the main points of a text or a lecture without giving examples or details, such as dates, numbers or statistics.