1. How Biology Influences Seawater CO 2 Chemistry Scripps Classroom Connectionhttp://earthref/SCC

2. How Low Can You Go? Materials List Clear plastic cups or 25 mL beakers (1 per student) Straws (1 per student) Distilled or Tap Water pH Indicator Dye Scripps Classroom Connectionhttp://earthref/SCC

3. Scripps Classroom Connectionhttp://earthref/SCC

4. Animals Breathe! CH 2 O + O 2 → CO 2 + H 2 O CO 2 increases pH decreases Scripps Classroom Connectionhttp://earthref/SCC

5. Plants Photosynthesize! CO 2 + H 2 O → CH 2 O + O 2 CO 2 decreases pH increases Scripps Classroom Connectionhttp://earthref/SCC

6. Calcification & Dissolution Ca 2+ + 2HCO 3 - ↔ CaCO 3 + CO 2 + H 2 O Calcification CO 2 increases pH decreases Dissolution CO 2 decreases pH increases Scripps Classroom Connectionhttp://earthref/SCC

7. Some Animals & Plants do All Four Processes! Coral Animal living on CaCO 3 skeleton. Symbiotic plants live inside them. Calcification Dissolution Respiration Photosynthesis Scripps Classroom Connectionhttp://earthref/SCC

8. Scripps Classroom Connectionhttp://earthref/SCC

9. Lab: How Does Biology Influence Seawater pH? Materials List Small tanks (2 per group) (beta fish tanks work well) Organisms for Tanks (fish, plants, snails, etc.) Fish Food Office Supplies (scissors, tape, glue, pencils, papers, etc.) Black Construction Paper or Black Garbage Bag Thermometer Hydrometer pH Indicator (Dye or Meters) Lamp Scripps Classroom Connectionhttp://earthref/SCC

10. Lab: Creating a Scientific Poster Scripps Classroom Connectionhttp://earthref/SCC