Students investigate the interconnected relationships within a simplified food web. Students deduce the impact on the food web when components are changed.

In this lesson students will explore the way soil and plants contribute to the purification of contaminated water in nature. Students conduct experiments to compare how successful soil and plants are in removing particulates from water by watering plants with contaminated water and assessing the filtered water for turbidity. This activity requires considerable preparation and resources but is simple and effective to run.

In this activity students will explore the processes through which water is made safe for drinking. Students will observe teacher demonstrations around the various processes involved in treating water and will also work in groups to conduct an experiment around one of the stages of water treatment. This activity requires considerable preparation and resources but is simple and effective to run.