| A | B |
|---|
| water cycle | the continuous process by which water moves from Earth's surface to the atmosphere and back. |
| evaporation | liquid to a gas |
| condensation | gas to a liquid |
| precipitation | rain, snow, sleet or hail |
| nitrogen fixation or fixing nitrogen | the process of changing free nitrogen gas into a usable form. |
| transpiration | the process by which water is lost through a plant's leaves. |
| photosynthesis | process in which autotrophs use carbon dioxide, sunlight, and water to make sugar and oxygen. |
| respiration | process where oxygen is taken in and carbon dioxide is released. |
| carbon cycle | repeated movement of carbon between Earth's atmosphere and organisms |
| fossil fuel | nonrenewable energy source formed from the remains of plants and animals that lived and died long ago. |
| coal, oil, natural gas | Name the 3 fossil fuels |
| nitrogen cycle | repeated movement of nitrogen compounds between the atmosphere, the soil, and living organisms. |
| legume | type of plant that has a symbiotic relationship with nitrogen fixing bacteria. |
| Decomposers | organism that breaks down wastes and remains of other organisms. |
| run off | precipitation not absorbed by soil. |
| ground water | water that flows or collects beneath the earth's surface. |
| bacteria | organisms which fix nitrogen, decompose litter and waste, and free nitrogen back to the atmosphere. |
