2. Figure 7-1 Earth’s water supply Problem: Fresh water availability

3. Key Facts The primary use for fresh water in U.S. is for agriculture. In our homes, we use the most fresh water to wash, clean, and flush. The typical person in an industrialized nation uses 700-1000 gallons per week!

4. Figure 7-4 Condensation (The amount of water in the air)

5. Human effects on the Hydrologic Cycle Figure 7-3 The Hydrologic cycle

6. Figure 7-6a Global air circulation

7. Figure 7-6b Global air flow patterns

8. Rain shadow Figure 7-7 Rain shadow

9. The Ogallala Aquifer Figure 7-16 Exploitation of an aquifer

10. Reasonable access to safe drinking water is defined as the availability of at least 20 liters per person per day from an improved source within 1 kilometer of the user's dwelling. Percentage of Population Without Reasonable Access to Safe Drinking Water 2008 http://www.theglobaleducationproject.org/earth/human-conditions.php

11. Population with access to safe water, 1990 pg. 213

12. Saltwater Intrusion Figure 7-18 Saltwater Intrusion

13. Mono Lake Excellent example of human interference with the water supply. The water in the lake was diverted from the lake to the city of Los Angeles. It became a salt bed. ↑ Salt concentration due to evaporation

19. Agriculture Green Revolution- the introduction of high- yield grains to agriculture. High yield varieties are not ideal for subsistence farming because they need pesticides and chemical fertilizers. Sustainable- Crop rotation, variety of crops, animal wastes for fertilizer. The best, most effective way to solve world hunger is to help people provide for themselves.

20. Water Quality tests Nitrates pH Phosphates What do they tell you about your water?

21. Figure 7-6c Global trade winds

22. Figure 7-5 Global Precipitation

23. Figure 7-5 Global precipitation