Compare and contrast the main types of freshwater ecosystems.

What is one way natural ecosystems can perform wastewater treatment? Explain the process and your thoughts on using such natural or created systems in wastewater treatment.

Compare and contrast the main types of freshwater ecosystems. Name and describe the major zones of a typical pond or lake.

Name three major types of water pollutants, and provide an example of each. Explain which classes of water pollutants you think are most important in your local area.

Define groundwater. Why do many scientists consider groundwater pollution a greater problem than surface water pollution?