Biogeochemical Cycles All matter cyclesand all cycles matter
Biogeochemical Cycles All matter cycles…and all cycles matter!
Carbon Cycle Carbon moves between the living & nonliving parts of the ecosystem 2 major driving forces: z Photosynthesis (plants take CO 2 in) z Cellular respiration (releases CO 2)
SINKS take IN carbon and store it z. Plants take in carbon dioxide during photosynthesis and release oxygen z. Oceans (especially cold water) & Earth’s crust
SOURCES release carbon OUT into the atmosphere z. Living things during respiration z. Combustion (burning fossil fuels) z. Fires z. Electricity
Climate Change zcarbon sinks & sources should be balanced, but they aren’t ztoo many carbon sources greenhouse effect becomes too strong z. Greenhouse effect = heat is trapped in by gases
Check for Understanding z. Which of the following is the best carbon sink? y. Burning fossil fuels y. Really hot water y. The ocean y. Small rocks
Nitrogen Cycle Nitrogen moves between the living & nonliving parts of the ecosystem
Nitrogen fixation z. Nitrogen gas (N 2) is changed into ammonia by nitrogen-fixing bacteria z. Legume plants (beans) have lots of these good bacteria on their roots
You. Tube Nitrogen Fixation – Seven Wonders of the Microbe World
Check for Understanding z. Where do we get most of our nitrogen from? y. The atmosphere y. Food we eat y. Eating fertilizer y. The ocean
- Slides: 10