Across
- 1. a system formed by the interaction of a community of organisms with their environment
- 5. the careful utilization of a natural resource in order to prevent depletion
- 7. naturally occurring materials such as coal, fertile land, etc, that can be used by humans
- 11. a geographical area within which the air frequently is confined or channeled
- 12. a supply of anything gathered at maturity and stored
- 13. the introduction of harmful substances or products into the environment
- 14. a state of rest or balance due to the equal action of opposing forces
- 16. the water beneath the surface of the ground, consisting largely of surface water that has seeped down: the source of water in springs and wells
- 18. to cause (water or other liquid) to percolate through something
Down
- 2. energy derived from the sun in the form of solar radiation
- 3. relating to a natural resource, such as solar energy, water, or wood, that is never used up or that can be replaced by new growth
- 4. capable of decaying through the action of living organisms
- 6. the region or area drained by a river, stream, etc
- 7. Relating to a natural resource, such as petroleum or a mineral ore, that cannot be replaced once it has been extracted or procured
- 8. material before being processed or manufactured into a final form
- 9. not only the waters that travel over the land surface and through channels to reach a stream but also interflow, the water that infiltrates the soil surface and travels by means of gravity toward a stream channel (always above the main groundwater level) and eventually empties into the channel
- 10. any property that can be converted into money
- 15. cycle the circulation of the earth's water, in which water evaporates from the sea into the atmosphere, where it condenses and falls as rain or snow, returning to the sea by rivers or returning to the atmosphere by evapotranspiration
- 17. to treat or process used or waste materials so as to make suitable for reuse