| A | B |
|---|
| cycle | something that has no begining or end, but continues on |
| natural cycle | a cycle that happens in nature |
| terrarium | a small model of a biosphere |
| example of cycles | rock and water |
| The water cycle | the movement of water throughout the earth |
| evaporation | when water is heated and changes from a liquid to a gas called water vapor |
| condensation | when water vapor cools and changes back into a liquid |
| precipitation | when water changes from a gas to snow, rain, fog,hail,sleet |
| ground water | water that filters down throgh the soil and is stored many feet down below the surface. |
| clouds | water vapor that you can see in the air |
| the nitrogen cycle | the process of changing nitrogen in the air to usable compounds that plants and animals can use |
| nitrogen fixation | when nitrogen is converted into usable compounds by lightning or through bacteria |
| legumes | beans, peas,clover,and soybeans |
| nodules | small pockets of nitrogen that are found on the roots of legumes |
| proteins | made by plants and needed by animals |
| dentrifying bacteria | bacteria that break down ammonia and other nitrogen compounds and convert them into nitrogen gas |
| decomposers | fungi and monerans that help dead organisms break down |
| Oxygen-carbondioxide cycle | when plants produce oxygen which animals need and animals give off carbondioxide which plants need. |
| oxygen | a gas found in our atmosphere |
| carbon dioxide | a gas given off by animals |
| nitrogen | a gas that makes up most of our atmosphere |
| high altitudes | have less oxygen gas |
| carbon dioxide is also made | when plants and animals decay |
| burning fossil fuels | put large amounts of carbondioxide into the atmosphere |
| global warming | the worldwide warming of the atmosphere |
| recycling | a way to save natural resources |
