Across
- 3. the property of having poles or being polar
- 6. the regions of the surface
- 8. variety of life in the world
- 10. the tension of the surface film of a liquid
- 13. living factors
- 14. an organism whose status in an ecosystem
- 16. nonliving factors
- 17. the activity or condition of competing
- 19. not allowing fluid to pass through
- 20. allowing liquids or gases to pass through it
Down
- 1. permeable rock that can transmit groundwater
- 2. the action or fact of forming a united whole
- 4. the action or process of adhering to a surface or object
- 5. liquid passing through a filter
- 7. the number of people, other living organisms
- 9. resources that limit growth
- 11. portion of land drained by a river
- 12. an area or ridge of land that separates waters
- 15. permeation of a liquid into something
- 18. a salt or ester of phosphoric acid