Across
- 3. The accumulation of some substance at a particular trophic level (e.g. mercury in tuna, DEET in eagle egg shells).
- 7. Water moving from land to sea, if it is not absorbed by the soil; part of the hydrologic cycle which replenishes seawater.
- 8. The collection of all living organisms in an area, along with their physical environment.
- 11. An animal which may only eat meat.
- 12. The amount of living plant and animal matter in a given area.
- 13. A layer of sediment deposit in soil; formed through vertical movement of water/minerals/organic matter and variations in biochemical activity.
- 14. The process by which every living thing derives energy from food; a process which requires oxygen and produces ATP.
Down
- 1. The process by which precipitation is absorbed into the soil; if this does not happen, the water becomes runoff.
- 2. The process by which plants produce food using light and carbon dioxide (CO2).
- 4. Water release from plants after removal from soil; after water is taken up by roots, it leaves the plant through this process.
- 5. Water falling from the atmosphere; part of the hydrologic cycle which replenishes surface water and seawater.
- 6. The process by which semiarid vegetation and soil become more desertlike as a result of human use.
- 9. The dynamic, porous layer of mineral and organic matter in which plants grow.
- 10. An animal which may only eat plant matter.
- 11. The cycle which involves photosynthesis, food webs, and respiration; this resource is plentiful and always moving through the biosphere, atmosphere, and hydrologic sphere.