Pollution may be caused by natural sources or human activities, but regardless of the cause, the result is the same. It can have detrimental effects on aquatic ecosystems as well as the health of those who depend on those sources of water, like us!
review verb (THINK AGAIN) C1 [ T ] to think or talk about something again, in order to make changes to it or to make a decision about it: The committee is reviewing the current arrangement/situation. Let's review what has happened so far.
The definition of summary is a statement presenting the main points. An example of summary is a type of review of what happened at a meeting. Summary is defined as a quick or short review of what happened. An example of summary is the explanation of Goldilocks and the Three Bears told in under two minutes.