This document discusses different types of water resources and how water is treated and distributed for human use. It explains that there are two main types of water - fresh water found in rivers, lakes, glaciers etc. and salt water found in oceans. It then outlines several key steps in the water treatment process, including settling out solids, filtering through sand and gravel, disinfecting with chemicals, and pumping clean water to homes. It also discusses water pollution and some natural and man-made causes, as well as the importance of conserving water resources.