| Term | Definition |
| Evaporation | Water going from the earth to the clouds from a liquid to gas states. |
| Condesation | Water changing from a gas to a liquid. |
| Precipitation | Water changing from a gas form in the clouds to fall to earth as either a liquid or solid. |
| Respiration | The air you breath out has water in it. |
| Run-off | Water running along the soil of the earth. |
| Percolation | Qater is filtered down through the soil. |
| Consumption | When organisms injest water. |
| Transperation | When plant leaves release water. |
| CO2 | Carbon Dioxide |
| C6H12O6 | Glucose (Sugar) |
| CH6 | Methane (Natural Gas) |
| CO3^-2 and HCO3^-1 | Carbonate ion/Bicarbonate ion |
| Photosynthesis | When plants convert the suns light energy into storable chemical energy. |
| Cellular Respiration | The process that most plants perform where they break down the glucose or product they made from photosynthesis to so that they may use its energy. |
| Macronutrient | The big six, the nutrients the body needs the most of. |
| Micronutrient | Body needs these nutrients but not in as large amounts as the big six. |
| Residence Times | The amount of time that passes while an element is stationed in a single resevoir before moving on to the next. |
| Flux/Rate of Transfer | The amount of an element that is passing through a resevoir in a specific amount of time. |
| Limiting Factor | The factor that can prevent growth within an element. |
| Assimilation/Biosynthesis | Is what occurs when a plant absorbs No2-1 or No3-1 to make proteins and ammino acids. |
| Lithification | When pressure and heat creates fossil fuels. |
| Decomposition | After an animal dies its remains it releases carbon into the atmosphere as well as phosphorus and nitrogen into the soil. |
| Coalification | The process of organisms being subjected to heat and pressure to create a fossil fuel. |
| Combustion | The burning of fossil fuels. |
| Volcanic Eruptions | These outspurts release massive amounts of CO2 into the air. |
| Uplifting/Weathering/Erosion | The slow but constant wear upon a rock that forces it smooth. |
| Digestion/Flatulence | When animals eat and then release methane gas. |
| PO4-3 | Phosphate. |
| Eutrophication | An area of water that has recieved to many nutrients and therefore becomes a dead zone. |
| Abosrtion | When roots of a plant species take in phosphorus. |
| Fertilizer | When added to the soil it helps to replenish the much needed nitrogen and phosphorus levels. |
| Guano | The poop of bird species that consists of a large amount of phosphorus. |
| N2 | Nitrogen |
| NO3-1 | Nitrate ion |
| NO2-1 | Nitrite ion |
| NO2 | Nitrogen dioxide gas |
| NH3 | Ammonia |
| NH4+1 | Ammonium ion |
| N2O | Nitrous oxide |
| Nitrogen Fixation | Atmospheric N2 is converted in to NO3-1/NH3 |
| De-nitrification | Bacteria takes away the oxygen of NO3-1 and converts it back to N2 |
| Urination | Animals relieve themselves of excess nitrogen. |
| Leaching | The slowly chipping away or breaking down of a rock that is physically punished and continues down river. |
| Ammonification | During the nitrogen cycle decomposing occurs and releases NO3-1. |
| Nitfification | NH3 is converted to NO2-1/NO3-1 |
| Igneous Rock | Rocked formed during vocanic eruptions. |
| Sedimentary Rock | Rock formed by lithification/weathering/erosion. |
| Metamorphic Rock | Rock that is created by escessive heat and pressure. |
| Lava/Magma Flows | Due to the large amount of heat it undergoes this rock is melted throughout the earth's crust and is released into the open atmosphere through volcano eruptions. |
| Heat/Pressure | Throughout the earth's crust this builds up and creates volcanos and can form metamorphic rock. |
| Melting | Heavy amounts of heat change solids into liquids. |