1. Cycling of Materials in Ecosystems: Biogeochemical Cycles
Powerpoint Templates

2. What is a biogeochemical cycle?
Exchange of matter through biosphere
Paths of water, carbon, nitrogen, and phosphorus pass from the nonliving environment (nonliving reservoir) to living organisms (living reservoir), and then back to the nonliving environment

3. Example of a Biogeochemical Cycle:
The Nitrogen Cycle
Nitrogen fixation: bacteria take nitrogen from the air and convert it to a form usable by plants

4. Example of a Biogeochemical Cycle:
The Carbon Cycle
Greenhouse effect: carbon dioxide traps heat in the atmosphere, making life possible

5. Example of a Biogeochemical Cycle:
The Water Cycle

6. Which cycle is least dependent on biotic processes?