The Carbon Cycle

1. The Carbon Cycle Reservoir of CO2 in atmosphere (about 0.04%) 5. 3. 1. 2. 4. Time Mining & extraction Fossil fuels

2. The Carbon Cycle Reservoir of CO2 in atmosphere (about 0.04%) Combustion Respiration Acid rain Photosynthesis Decomposition Time Mining & extraction Fossil fuels

3. The nitrogen cycle Reservoir of nitrogen (N2) in atmosphere (about 80%) 4. 1. 3. 2. Excessive NO3- & NH4+ in aquatic ecosystems can cause eutrophication. NO3- & NH4+ (from plants and animals) NO3- & NH4+ (later used by plants) Death , decay, & excretion

4. The nitrogen cycle Reservoir of nitrogen (N2) in atmosphere (about 80%) 4. Industrial fixation 1. Denitrification 3. Atmospheric fixation 2. Biological fixation Excessive NO3- & NH4+ in aquatic ecosystems can cause eutrophication. NO3- & NH4+ (from plants and animals) NO3- & NH4+ (later used by plants) Death , decay, & excretion

5. The phosphorous cycle (Corn) Excessive phosphates in aquatic ecosystems can cause eutrophication. Detergents & fertilizers Absorption Animal & plant wastes and remains Reservoir in phosphate rocks Biologically active phosphate in soil