1. 2.3 The Cycling of Materials
Meredith Meyer, Sarah Chandler, Shyanne Slimmer, Veronica Parado

2. Carbon Cycle
(def.) the movement of carbon from the nonliving environment into living things and back
Exists in air, water, organisms
- photosynthesis
- carbohydrates
-cellular respiration
Stored in limestone, fats, oils, soil
-fossil fuels

3. Humans and the Carbon Cycle
Burning of fossil fuels
- carbon dioxide and global warming

4. Nitrogen Cycle
(def.) the process in which nitrogen circulates among the air, soil, water, plants, and animals in an ecosystem
Build proteins in organisms
78% of gas in atmosphere
Nitrogen fixation
- bacteria (in roots of legumes)
- usable form (ammonia)
- excess nitrogen is released into soil

5. Nitrogen Cycle Returned through decomposition
- majority returned to soil
- small portion released into atmosphere

6. Phosphorus Cycle
(def.) the cyclic movement of phosphorus in different chemical forms from the environment to organisms and then back to the environment
Element that makes up cells of organisms
- ATP
- Digestion, soil, water

7. Phosphorus Cycle Erosion - into soil and water - into ocean
- creates phosphate sediment

8. Fertilizers Contain nitrogen and phosphorus run-off
- hypereutrophication

9. Acid Precipitation
Result of burning of fossil fuels and release of nitric oxide
- nitric oxide + oxygen + water vapor
Nitric acid dissolves in rain or snow, causing acid precipitation