1. Biogeochemical Cycles
All Matter is recycled
There are four cycles we will discuss:
Carbon Cycle
Nitrogen Cycle
Phosphorus Cycle
Water/Hydrologic Cycle

2. Biogeochemical Cycles
Life Earth Atoms, Elements, and Compounds
Nitrogen, Carbon, Phosphorus, and Water Cycle all demonstrate how elements and compounds recycle through the Earth in order to support life.

3. Carbon Cycle

4. Carbon Cycle Carbon exists as CO2 in the atmosphere
Photosynthesis uses CO2 to form sugar
Returns to the atmosphere by
Cellular Respiration
Decay
Fossil Fuels burning

5. Nitrogen Cycle

6. Nitrogen Cycle 78% of air is N in a nonusable form
Usable formed in soil by:
Bacteria doing nitrogen fixation
Lightening doing atmospheric fixation
Plants use nitrates and ammonium in growth
Herbivores consume plants and turn N plant proteins into N animal proteins
Denitrifying bacteria return N to the atmosphere

7. Phosphorus Cycle

8. Phosphorus Cycle 2 cycles: short term and long term
Short term: phosphorus in soil->plants-> herbivores-> decay into soil
Long term: phosphates washed out to sea and become incorporated into sediment when exposed they reenter the cycle

9. Water/Hydrologic Cycle

10. Water/Hydrologic Cycle
Evaporation: liquid to gas
Transpiration: evaporation of water on plant leaves
Condensation: gas to liquid
Precipitation: rain