Question

fill in the blank to complete each statement.
the land that supplies water to a river system is called a
pollution from a single, identifiable source is called source pollution.
pollution that is difficult to link to a particular origin is called source pollution.

Explanation:

1. A drainage basin (or watershed) is the land area that collects and channels water into a river system.
2. Point source pollution comes from a single, specific, identifiable discharge point.
3. Nonpoint source pollution originates from diffuse, widespread sources that are hard to trace to one single origin.

Answer:

1. watershed (or drainage basin)
2. point
3. nonpoint