GEOLOGY

Detailed explanation-1: -Nonpoint source pollution comes from oil, pet waste, pesticide, herbicide, fertilizer, road salt, bacteria, sediment, and any other contaminant that ends up on the ground naturally or from human activity.

Detailed explanation-2: -Point-source pollution is easy to identify. As the name suggests, it comes from a single place. Nonpoint-source pollution is harder to identify and harder to address. It is pollution that comes from many places, all at once.

Detailed explanation-3: -Urban and Suburban lands cause water pollution by the field run offs and thus do not originate from a single point. Hence, they are non-point sources of water pollution.

Detailed explanation-4: -Sediment. Sediment is the loose sand, clay, silt, and other soil that settles to the bottom of a waterbody. The U.S. Environmental Protection Agency lists sediment as the most common pollutant in rivers, streams, lakes, and reservoirs.

Detailed explanation-5: -There are two categories of water pollution: Point source pollution is pollution where the source of the pollution can be identified, such as a spill or discharge. Non-point source pollution is when the source of pollution either cannot be identified or may come from many sources.