| A | B |
|---|
| deforestation | forest destruction that results from human activity |
| energy flow | the movement of energy through an ecosystem |
| fossil fuel | a fuel (oil, coal, natural gas) that comes from the decayed remains of organisms that lived millions of years ago |
| global warming | an increase in Earth's average surface temperature caused by an increase in greenhouse gases |
| nonrenewable resource | any resource, such as fossil fuels and minerals, that cannot be replaced |
| pollution | a harmful change in the chemical makeup of the soil, water, or air |
| renewable resources | Earth's resources, such as our food supply and solar energy, which given time, can be replaced |
| water cycle | the process by which water continuously moves from Earth's surface the the atmosphere and back |
| greenhouse effect | the trapping of heat by gases in the atmosphere |
| greenhouse gas | an atmospheric gas that traps heat (ex. carbon dioxide) |
| material resource | a natural resource used to make things |
| energy resource | a natural source that humans use for energy |
| natural resource | any natural materials used by humans |
| urbanization | the growth of cities and towns |
| land degradation | the process by which human activity damages land |
| desertification | the process of making an area more desert like |
| point-source pollution | pollution that comes from one specific source |
| non-point source pollution | pollution that comes from many sources |
| eutrophication | the increase of the amounts of nutrients in a marine or aquatic ecosystem. |
| conservation | the wise use and preservation of natural resources |
| stewardship | behavior that protects, conserves and reclaims natural resouces |
