1. BIOGEOCHEMICAL CYCLES

2. NEEDS OF ORGANISMS All organisms need more then just Energy
95 percent of body is made up of just 4 elements:
Hydrogen
Oxygen
Nitrogen
Carbon

3. RECYCLING IN THE BIOSPHERE
Matter is recycled in ecosystems
Biogeochemical cycles = chemicals are passed from one organism to another (BIO), and also travel through air and soil (GEO).

4. BIOGEOCHEMICAL CYCLES
Matter can cycle through the biosphere because elements are not “used up,” but are only transformed.

5. Carbon Cycle One of the most important to humans because carbon is:
one of the primary elements forming human tissues
necessary to plants, the basis of human food

6. Carbon Cycle Important to the climate system :
carbon dioxide (CO2 ) and methane (CH4 ) are greenhouse gases which help set global temperatures

7. Nitrogen Cycle Important cycle because:
nitrogen is a necessary nutrient
nitrogen is part of acid rain

8. Phosphorus Cycle Important because:
Cannot be transferred from the ocean to plants very effectively.
Incorporated into many molecules essential for life such as ATP (Energy source) and backbone of DNA and RNA

9. CYCLES – NITROGEN, CARBON, AND PHOSPHOROUS
AIR
SOIL
LIFE

10. SUMMARY – VENN DIAGRAM Nitrogen Carbon Phosphorus C & N C, N, & P
C & P
N & P
Nitrogen