Question

why is nonpoint source pollution more challenging to monitor and prevent than point source pollution?
a. the pollution is not in large amounts.

b. nonpoint source pollution is usually caused by big factories and it is very costly to clean up.

c. the source of the pollution is more difficult to identify.

d. nonpoint source pollution affects groundwater, while point source pollution does not.

Explanation:

Point - source pollution comes from a single, identifiable source (e.g., a factory pipe). Non - point source pollution (e.g., runoff from agricultural fields, urban areas) has multiple, diffuse sources. Since non - point source pollution has many and indistinct origins, it is harder to track down the exact sources. Option A is incorrect as non - point source pollution can be in large amounts. Option B is wrong because non - point source pollution is not usually caused by big factories (that's more of a point - source). Option D is incorrect as both can affect groundwater.

Answer:

C. The source of the pollution is more difficult to identify.