Question

a environmental scientist is trying to trace the source of elevated nitrogen levels in a lake. the pollution appears to be coming from agricultural fields, residential lawns, and golf courses throughout the watershed. this investigation is challenging primarily because.
the pollution sources are scattered across a large area
nitrogen pollution is not harmful to aquatic ecosystems
agricultural pollution cannot be measured accurately
only point sources can cause nitrogen pollution

what makes buffer strips an effective solution specifically for nonpoint source pollution?
they concentrate pollution into one manageable location
they only work for point source pollution control
they filter contaminants from runoff before it reaches waterways
they eliminate the need for water treatment plants

which combination of characteristics best describes point source pollution?
multiple locations, gradual effects, harder to control
widespread areas, natural causes, permanent damage

Explanation:

Step1: Analyze the first question

The pollution is coming from multiple areas (agricultural fields, residential lawns, and golf courses) across a large watershed. This is a non - point source pollution problem. Non - point source pollution is difficult to trace as the sources are scattered.

Step2: Analyze the second question

Buffer strips are effective for non - point source pollution because they filter contaminants from runoff (like from agricultural fields, lawns etc.) before it reaches waterways.

Step3: Analyze the third question

Point source pollution has a single identifiable source (not multiple or widespread). The characteristics of point source pollution are not multiple locations, gradual effects, or widespread areas.

Answer:

• First question: The pollution sources are scattered across a large area.
• Second question: They filter contaminants from runoff before it reaches waterways.
• Third question: (Since the options provided for the third question are incomplete, we assume there is an error. But based on the knowledge, point source pollution has a single identifiable source. If we assume the correct option is the one with a single identifiable source, but with the given options, they seem incorrect. However, if we follow the logic of the first two questions, we can't answer this one properly. But for illustration purposes, if we assume the correct option is not among the visible ones, but if we had to choose based on the knowledge of point source pollution (single source, easier to control compared to non - point), the options given are wrong. But to follow the process, we can't answer the third one correctly with the given options.)