1. Resource cycles in ecosystems

2. Cycles  Essential nutrients for living things flow through the ecosystem.  The reservoirs can be in the air, land, or oceans.  Important resources cycle through the living and nonliving parts of ecosystems

3. Water cycle Water moves from the air to land as precipitation then back up via evaporation & transpiration

4. Carbon cycle  Carbon cycles from atmospheric CO 2 into living things through photosynthesis  CO 2 returns to atmosphere from respiration & burning  Oceans, soils & plants act as a carbon reservoirs

5. Nitrogen cycle Ns an essential nutrient for all organismsNitrogen is an essential nutrient for all organisms It exists in the atmosphere as N 2It exists in the atmosphere as N 2 It is transformed by bacteria into a form plants can useIt is transformed by bacteria into a form plants can use

6. Human impact on natural cycles Human activity such as burning fossil fuels & deforestation has greatly impacted natural nutrient cycles, causing air, water, and soil pollution

7. Review 1. What is the process by which water moves from plants into the atmosphere? 2. In what form do plants take in carbon? 3. What type of organism makes atmospheric nitrogen usable for other living things?