1. DO NOW Draw the hydrologic cycle Label all parts of your diagram

2. Biogeochemical Nutrient Cycles

3. Hydrologic Cycle

4. Reserviors

5. Residence Times

6. Biogeochemical Nutrient Cycles Nitrogen Phosphorus Sulfur Carbon-Oxygen Hydrologic Rock

7. The nitrogen cycle

8. The phosphorus cycle

9. The sulfur cycle

10. The carbon-oxygen cycle

11. The hydrologic cycle

12. The rock cycle Rock cycle = The heating, melting, cooling, breaking and reassembling of rocks and minerals Rocks help determine soil chemistry, which influences ecosystems Helps us appreciate the formation and conservation of soils, mineral resources, fossil fuels, and other natural resources

13. Newton’s Laws Conservation of Mass – mass cannot be created or destroyed, but can be changed to energy

14. Newton’s Laws - First Thermodynamics – inertia – an object in motion stays in motion unless acted upon by an outside force

15. Newton’s Laws - Second Thermodynamics – entropy– disorder increases Think of entropy as heat loss We must add more energy to compensate for the heat loss

16. Hypoxia and the Gulf of Mexico’s Dead Zone (Read pp202-203) Observations: low oxygen levels - hypoxia Hypothesis: caused by nutrients (fertilizers) that ran into the Gulf from rivers Experiments: monitoring oxygen (long term), water sampling (N, NaCl. Bacteria, phytoplankton); observed life; analyzed historical data Results: phytoplankton receiving too much phosphorus from farming & sewage treatment plants