3. Thermal Pollution ► What is it? Power plants and industries use water from lakes or rivers as a coolant but return it to the environment at a higher than normal temperature

4. TP ► What causes it? Cold water is taken from great depths and returned warmer

5. TP ► Why is it bad? Species suffocate in the presence of warmer water – Warm water does not hold as much oxygen as cold water Some organisms move away Contributes to algal and bacterial growth

7. TP ► What can be done about it? Find other uses for heated water

9. Erosion ► What is it? The process by which earth’s surface is worn away by: – Water – Glaciers – Wind – Waves – Humans

10. E ► What causes it? Deforestation Overgrazing Poor land management

11. E ► Why is it bad? Nutrient-rich soil is washed away Sediments contaminate water supplies Desertification

13. E ► What can be done about it? Planting trees Cover crops Wind breaks Terrace farming Runoff barriers Rotate pastures