Biogeochemical Cycles All matter cycles…and all cycles matter!
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Transcript of Biogeochemical Cycles All matter cycles…and all cycles matter!
Biogeochemical Cycles
All matter cycles…and all cycles matter!
Carbon CycleCarbon Cycle
Carbon moves between the living & nonliving parts of the ecosystem
2 major driving forces: Photosynthesis (plants take CO2 in) Cellular respiration (releases CO2)
SINKS take IN carbon and store itSINKS take IN carbon and store it
Plants take in carbon dioxide during Plants take in carbon dioxide during photosynthesis and release oxygenphotosynthesis and release oxygen
Oceans (especially cold water) & Earth’s Oceans (especially cold water) & Earth’s crustcrust
Living things during respiration
Combustion (burning fossil fuels)
Fires
Electricity
SOURCES release carbon OUT into SOURCES release carbon OUT into the atmospherethe atmosphere
Climate Change
carbon sinks & sources should be balanced, but they aren’t
too many carbon sources greenhouse effect becomes too strong
Greenhouse effect = heat is trapped in by gases
Check for Understanding
Which of the following is the best carbon sink? Burning fossil fuels Really hot water The ocean Small rocks
Nitrogen CycleNitrogen Cycle
Nitrogen moves between the living & nonliving parts of the ecosystem
Nitrogen fixationNitrogen fixation
Nitrogen gas (N2) is changed into ammonia by nitrogen-fixing bacteria
Legume plants (beans) have lots of these good bacteria on their roots
YouTube
Nitrogen Fixation – Seven Wonders of the Microbe World
Check for Understanding
Where do we get most of our nitrogen from?
The atmosphere Food we eat Eating fertilizer The ocean