| A | B |
|---|
| Point source pollution | Pollutants discharged from a single identifiable location |
| Radioactive isotope | An atom that gives off nuclear radiation and has the same number of protons (atomic number) as another atom but a different number of neutrons. |
| Recycling | Collecting and reprocessing a resource or product to make into new products. |
| Regulation | A rule or order issued by an executive authority or regulatory agency of a government and having the force of law. |
| Renewable | A naturally occurring raw material or form of energy that will be replenished through natural ecological cycles or sound management practices |
| Risk management | A strategy developed to reduce or control the chance of harm or loss to one’s health or life |
| Scale | Relates concepts and ideas to one another by some measurement |
| Science | Search for understanding the natural world using inquiry and experimentation. |
| Shredder | Through chewing and/or grinding, microorganisms feed on non-woody coarse particulate matter, primarily leaves. |
| Stream order | Energy and nutrient flow that increases as water moves toward the oceans (e.g., the smallest stream (primary) that ends when rivers flow into oceans). |
| Succession | The series of changes that occur in an ecosystem with the passing of time. |
| Sustainability | The ability to keep in existence or maintain. |
| System | A group of related objects that work together to achieve a desired result. |
| Closed Loop system | A group of related objects that have feedback and can modify themselves. |
| Open Loop system | A group of related objects that do not have feedback and cannot modify themselves. |
| Subsystem | A group of related objects that make up a larger system (e.g., automobiles have electrical systems, fuel systems). |
