solved I’m trying to study for my Writing course and I

I’m trying to study for my Writing course and I need some help to understand this question.

Instructions
In this unit, you became familiar with water pollution, drinking water sources, and drinking water treatment processes.
For your essay, make certain to address the following components:

the impact of soil erosion on water quality in receiving waters,
the dissolved oxygen profile downstream of a wastewater discharge,
eutrophication of lakes,
sources of groundwater pollution,
drinking water sources, and
typical municipal drinking water processes for groundwater and surface water sources in your location.