Chemical recycling

1. Chemical recycling

2. The water cycle • Why is water important?

3. The water cycle • Why is water important? • Best naturally occurring solvent

4. The water cycle • Why is water important? • Best naturally occurring solvent • Most chemical reactions of the body take place in a water environment

5. The water cycle • Why is water important? • Best naturally occurring solvent • Most chemical reactions of the body take place in a water environment • Main transport medium (blood, sap etc)

6. The water cycle • Why is water important? • Best naturally occurring solvent • Most chemical reactions of the body take place in a water environment • Main transport medium (blood, sap etc) • Affects the pH of cells.

7. The water cycle • Why is water important? • Best naturally occurring solvent • Most chemical reactions of the body take place in a water environment • Main transport medium (blood, sap etc) • Affects the pH of cells. • Resists rapid temperature changes

8. The water cycle • The cycle – continuous movement of water from the atmosphere to the earth

9. The water cycle • The cycle – continuous movement of water from the atmosphere to the earth (precipitation) • From the earth and sea back to the atmosphere (evaporation).

10. The water cycle • The cycle – continuous movement of water from the atmosphere to the earth (precipitation) • From the earth and sea back to the atmosphere (evaporation). • Evaporation – Sun’s energy turns water to vapour, and it rises into the atmosphere. Mostly occurs over the oceans.

11. The water cycle • The cycle – continuous movement of water from the atmosphere to the earth (precipitation) • From the earth and sea back to the atmosphere (evaporation). • Evaporation – Sun’s energy turns water to vapour, and it rises into the atmosphere. Mostly occurs over the oceans. • Transpiration – Water stored in plant tissue moves up the plant. It leaves (pun!) as water vapour through stomata in the leaves.

12. The water cycle • The cycle – continuous movement of water from the atmosphere to the earth (precipitation) • From the earth and sea back to the atmosphere (evaporation). • Evaporation – Sun’s energy turns water to vapour, and it rises into the atmosphere. Mostly occurs over the oceans. • Transpiration – Water stored in plant tissue moves up the plant. It leaves (pun!) as water vapour through stomata in the leaves. It also moves nutrients through plants, and increases retention.

13. The water cycle • Cycling of the metabolic water happens through:

14. The water cycle • Cycling of the metabolic water happens through: • Photosynthesis and respiration

15. The water cycle • Cycling of the metabolic water happens through: • Photosynthesis and respiration • Drinking and excretion

16. The water cycle • Cycling of the metabolic water happens through: • Photosynthesis and respiration • Drinking and excretion • Fossil fuel burning, which returns water to the atmosphere

17. The water cycle • Cycling of the metabolic water happens through: • Photosynthesis and respiration • Drinking and excretion • Fossil fuel burning, which returns water to the atmosphere • Micro-organisms in the death and decay process complete the breakdown of molecules, returning water to the cycle.

18. Under your diagram: • Water evaporates off the sea and land, and transpires off the plant life.

19. Under your diagram: • Water evaporates off the sea and land, and transpires off the plant life. • The water vapour rises up to the colder parts of the sky and condenses into clouds.

20. Under your diagram: • Water evaporates off the sea and land, and transpires off the plant life. • The water vapour rises up to the colder parts of the sky and condenses into clouds. • Clouds are then blown by the wind, and later drop the water as rain, snow or hail.

21. Under your diagram: • Water evaporates off the sea and land, and transpires off the plant life. • The water vapour rises up to the colder parts of the sky and condenses into clouds. • Clouds are then blown by the wind, and later drop the water as rain, snow or hail. • Water then passes into underground waterways or rivers that flow back to the sea.

22. How humans affect the cycle • Depletion of surface and groundwater supplies by irrigation

23. How humans affect the cycle • Depletion of surface and groundwater supplies by irrigation • Wasteful use of water, often by people in cities

24. How humans affect the cycle • Depletion of surface and groundwater supplies by irrigation • Wasteful use of water, often by people in cities • Polluting the water with sewage, fertiliser run-off etc.