| A | B |
|---|
| water cycle | The continuous process by which water moves from Earth's surface to the atmosphere and back |
| evaporation | The process by which molecules of a liquid absorb energy and change to the gas state |
| condensation | The process by which a gas changes to a liquid |
| precipitation | Water falling from the atmosphere |
| atmosphere | The layer of gases surrounding the earth |
| runoff | Water that does not soak into the ground, but ends up in storm drains and/or creeks |
| percolation | Water soaking into the ground |
| aerobic respiration | The process of combining oxygen and glucose to produce carbon dioxide, water and energy |
| climate | The typical weather pattern in an area over a long period of time |
| weather | Current conditions in the atmosphere |
| carbon cycle | The process of carbon moving from the atmosphere into living things and back into the atmosphere |
| anaerobic respiration | Using glucose for energy with out oxygen |
| decomposition | The process of breaking down plant and animal waste, making nutrients available for other living things |
| photosynthesis | The process in which organisms use water, carbon dioxide and sunlight to produce glucose and oxygen |
| nitrogen cycle | The process of nitrogen moving from the atmosphere to the soil, into living things and back into the atmosphere |
| nitrogen fixation | The process of changing free nitrogen gas into a usable form |
| denitrification | Process that returns nitrogen gas to the atmosphere |
| mutualism | A symbiotic relationship between two species where both species benefit |
| nodules | Bumps on the roots of certain plants that house nitrogen fixing bacteria |
| Rhizobia | Type of bacteria commonly found in nodules that can fix nitrogen |
