Terms : Hide Images
| 9657881115 | Reliable Runoff | The runoff that is stable from one year to the next and can be counted on for water supply |  | 0 |
| 9787877539 | Renewable Resource | A resource such as timber, water, or air, that is naturally recycled by artificial processes within a time framework useful for the people |  | 1 |
| 9787922851 | replacement level fertility | Fertility rate required for the population to remain a constant size |  | 2 |
| 9787944799 | reproduction | The production of offspring by sexual or asexual process |  | 3 |
| 9787977549 | reproductive isolation | Refers to the situation where different species live in the same area but properties of these individuals prevent interbreeding and are also known as isolating mechanisms |  | 4 |
| 9788014876 | reproductive potential | the relative capacity of a species to reproduce itself under optimal conditions |  | 5 |
| 9788031126 | reserves | Known and identified deposits of earth materials from which useful materials can be extracted profitably without existing technology and under present economic and legal conditons | 6 | |
| 9788058706 | resource | Reserves plus other deposits of useful earth materials that may eventually become available |  | 7 |
| 9788088366 | resource productivity | using fewer natural resources per unit of consumption to do more with less in which lessens the environmental impact from consumption | 8 | |
| 9788122182 | respiration | The complex series of chemical reactions in organisms that make energy available for use. Water, carbon dioxide, and energy are products of respiration |  | 9 |
| 9788163659 | restoration ecology | The field within the science of ecology with the goal to return damaged ecosystems to ones that are functional, sustainable, and more natural. |  | 10 |
| 9788190491 | reuse | With respect to waste management, refers to finding ways to reuse production and materials so they need not be disposed of |  | 11 |
| 9788214703 | riparian zones | The interface between land and a river or stream. |  | 12 |
| 9788237556 | r-selected species | Those that emphasize high growth rates, typically exploit less crowded ecological niches, and produce many offspring in which have a low probability of surviving |  | 13 |
| 9788265924 | r-strategist | Organisms that typically live in unstable and unpredictable environments. R strategist have a high r-value and low k-value since the organisms can grow fast yet die off. |  | 14 |
| 9788306360 | rule of 70 | A way to estimate the number of years it takes for a certain variable to double. Divide seventy by the growth rate |  | 15 |
| 9788332266 | runoff | A part of the water cycle in which water flows over the land as surface water rather than be absorbed into groundwater or evaporating. Runoff causes erosion and also carries off chemicals to the rivers |  | 16 |
| 9788387403 | salinity | the concentration of dissolved salts in water usually expressed in parts per thousand by weight |  | 17 |
| 9788403934 | salinization | The process in which water soluble salts accumulate and increasing salt content | 18 | |
| 9788448862 | salt water intrusion | The movement of saline water into freshwater aquifers which can lead to contamination of drinking water sources and other consequences. |  | 19 |
| 9788478895 | scavenger | A carnivorous and herbivorous feeding behavior in which the scavenger feeds on dead animal and plant material present in its habitat. |  | 20 |
