| Term | Definition |
| Macronutrient | large amounts are needed for life |
| Micronutrient | small amounts are needed for life |
| Residence Times | the amount of time an element stays in a reservoir |
| Flux/rate of transfer | the rate at which the element moves between resevoirs |
| limiting factor | the factor that keeps the population from growing |
| evaporation | when a liquid turns to a gas |
| condesation | when a gas turns to a liquid |
| Precipitation | when water falls from the sky |
| respiration | moisture is released through the act of breathing |
| run-off | when water runs off fields and into streams |
| percolation | when water passes through something and is filtered as a result |
| consumption | when a living animal consumes/eats/drinks it |
| transpiration | when plants release moisture (water vapor) into the air |
| Photosynthesis | plants use sunlight, and water |
| Cellular respiration | when cells break down nutrients using oxygen |
| biosynthesis | when organisms produce larger molecules with smaller ones |
| Lithification | sediments being compacted into rocks |
| Decomposition | organic compounds break up |
| coalification | when organic matter is compressed with heat to make coal |
| combustion | when something reacts with oxygen and creates heat and light |
| volcanic eruptons | magma pressure builds up and is released all at once in an explosion |
| uplifting/weathering/erosion | when wind or water moves the soil and erodes it |
| Digestion/flatulence | organic matter is consumed and released as gas |
| diffusion | when molecules move to where there is more space |
| eutrophication | algae grows in water and depletes said water of oxygen |
| guano | sea bird poop |
| fertilizer | usually manure, its put in soil to enrich it with nutrients high in nitrogen and phosepherous |
| nitrogen fixation | when bacteria converts nitrogen to ammonia |
| de-nitrification | nitrates into nitrate gas |
| ammonification | when bacteria turn organic material in to ammonia |
| nitrification | nitrate gas into nitrates |
| igneous rock | made from magma |
| sedimentary rock | made from the compacting of sediments |
| metamorphic rock | a rock that was changed by haet or pressure |