| A | B |
|---|
| Water is our most important... | natural resource. |
| Our rivers and streams can be harmed by farming ... | pesticides. |
| Waste water is treated at ... | sewage treatment plants. |
| Germs in wastewater can cause... | disease. |
| One thing that must remain the same for many animals to survive is... | water temperature. |
| All foodchains, even water foodchains, start with... | plants. |
| One material which floats on water and is very difficult to remove is... | oil. |
| Harmful materials in the water can travel through a... | food chain. |
