1. Cycling of Matter

2. Cycles in the Biosphere
Energy is transformed into usable forms to support the functions of an ecosystem
The cycling of nutrients in the biosphere involves both matter in living organisms and physical processes found in the environment such as weathering

3. Biogeochemical Cycles
A pathway by which a chemical element moves through both biotic and abiotic parts of an ecosystem
Chemical elements such as oxygen, carbon, nitrogen, and phosphorus, circulate from the environment into plants and animals and back again into the environment

4. Types of Cycles
Water Cycle

5. Types of Cycles
Carbon and Oxygen Cycle

6. Types of Cycles
The Nitrogen Cycle

7. The Nitrogen Cycle
The capture and conversion of nitrogen into a form that is useable by plants is called nitrogen fixation
Nitrogen is returned to the soil in several ways:
Animals urinate
Organisms die
Organisms convert ammonia into nitrogen compounds
Denitrification

8. Denitrification
A microbially facilitated process where nitrate is reduced and ultimately produces molecular nitrogen (N2)
It is returned to the soil to be reused and becomes part of the nitrogen cycle again

9. Types of Cycles
The Phosphorous Cycle