Excess nitrogen fertilizers sometimes drain into waterways that flow into the Chesapeake Bay. This nitrogen may cause algae blooms, which reduce dissolved oxygen in the water. How does nitrogen negatively affect the Chesapeake Bay?

The questions have been asked in several important state and regional science exams in the United States. For example: TAKS-Texas Assessment of Knowledge and Skills, New York State Educational Department Regents exams, California Standards Test, etc.