14.2 Matter cycles through ecosystems

Vocabulary: cycle, water cycle, carbon cycle, nitrogen cycle

Review
1. Diagrams should include precipitation, evaporation, and condensation
2. Green plants and algae remove CO2 from air. Animals get carbon from food and release carbon as CO2. The burning of fossil fuels, wood, or other organisms and decay release carbon.
3. Bacteria break down nitrogen compounds into nitrogen gas. Lightning breaks apart pure nitrogen in the atmosphere.
4. Plants might grow larger or increase in numbers.
5. Both have a gaseous form. Plants make both elements available to animals. Decay returns both elements to the atmosphere.
6. Diagrams should include activity, source, and exit route.