1. 2.2 Nutrient Cycle- Part I (Text pages 68 – 91)

3. Page 8, Data Booklet.

4. 2.2 Nutrient Cycles in Ecosystems Nutrient: A chemical required for growth and other life processes. A chemical required for growth and other life processes. 5 nutrient that limit life in ecosystem- carbon, phosphorous, hydrogen, nitrogen oxygen. 5 nutrient that limit life in ecosystem- carbon, phosphorous, hydrogen, nitrogen oxygen. Stored in atmosphere, oceans and land masses Stored in atmosphere, oceans and land masses Nutrient cycles – the flow of nutrients IN and OUT of the land, ocean, atmosphere and deep rock. There are three different cycles which we will focus on to help us understand nutrient cycles: Carbon, Nitrogen and phosphorous cycle.

5. CARBON CYCLE CARBON CYCLE A. Carbon Facts: ► Carbon is found in all living matter. ► Places that carbon is found are called stores (carbon sink) Short-term Stores Long-term Stores - -Plants- underground (oil, gas, - -Decaying matter in soil natural gas and coal) - -atmosphere (air): CO 2 - sedimentary rock - Top ocean Layer (limestone) - Deep waters (dissolved CO 2 ) Note: Formation of Sedimentary Rock Decaying Organism + soil + Pressure and time  Calcium carbonate (CaCO 3 )  Sedimentary Rock

6. B. Carbon Cycling: 1. Photosynthesis: CO2  Carbs  in plants, algae and cyanobacteria CO 2 + H 2 O + sunlight  C 6 H 12 O 6 + O 2 2. Cellular respiration: release CO 2 in to atmosphere  in cells of all living things (plants and animals) C 6 H 12 O 6 + O 2  CO 2 + H 2 O + ENERGY (energy is used for growth, repair etc.) Primary consumer eat carbs

7. 3. Decomposition (rotting): Break down of Dead Organism ex. bacteria/fungi break down cellulose (found in plants) or trees  CO 2 ex. bacteria/fungi break down cellulose (found in plants) or trees  CO 2 (atmosphere) 4. Combustion: (burning, engines, volcanoes, forest fires) fossil fuels + O 2  CO 2 + H 2 O + ENERGY (oil, gas, natural gas, coal)

8. 4. Ocean Processes: ► - Ocean mixing moves CO 2 around the world ► - CO 2 sinks in cold ocean waters  flows to the warm equator and evaporates into the air

9. Human Activities & CO 2 1. Burning Fossil Fuels  CO 2 in atmosphere has increased 30% in past 160 years.  In the 160,000 years before that, it only increased 1-3%.  Carbon is removed from long-term storage as we mine coal & drill for oil and gas.  CO 2 is also a greenhouse gas, (traps heat in atmosphere) 2. Removing Trees  Trees absorb CO 2, so when they are cut down, CO 2 is released into the air.  Other crops don’t remove as much CO 2