| A | B |
|---|
| Legumes | soybeans, clover, peanuts |
| Rhizobium | Nitrogen-fixing bacteria |
| Photosynthesis | process taking carbon from the atmosphere |
| Respiration | process returning carbon to the atmosphere |
| Condensation | changing of a gas to a liquid |
| Evaporation | changing of a liquid to a gas |
| Precipitation | falling particles |
| Percolation | seeping of water into the ground |
| Ground water | water in the ground |
| runoff | water that flows across the surface of the earth |
| 78% of Atmosphere | Nitrogen |
| Less than 1% of the atmosphere | CO2 |
| Un-natural process returning carbon to the atmosphere | burning fossil fuels |
| Chlorofluorocarbons, CFCs | cause of ozone depletion |
| Nitrogen Fixation | the cahnging of nitrogen gas into a form that can be used by organisms |
| Transpiration | loss of water from plants |
| Condensing of water vapor in the sky | cloud formation |
| Evaporation of Polluted Water | Will clean the water |
| Common Decomposers | Worms, Bacteria, Fungi |
| Composting | Using decomposers to break down plant material |
