Across
- 4. a biome of or pertaining to land as in terrestrial ecosystem
- 6. the first species to populate an area
- 11. reestablisment of a damaged ecosystem in an area were the soil was left intact
- 13. a gradual increase in average global temperature
- 15. symbiotic association between a fungus and a photosynthetic organism
- 17. permanently dark layer of the oceans
- 19. release of harmul materials into the enviroment
- 20. a biome that occurs in water
- 21. a species has an unusually large effect on its ecosystem
Down
- 1. a zone of the ocean were light penetration is high
- 2. the tidal mouth of a large river
- 3. no two species can occupy the same niche in the same habitat
- 5. succession that occurs on surfaces were no soil exists
- 7. a group of ecosystems that share similar climates and organisms
- 8. an opening in the sea floor out of which heated mineral-rich water flows
- 9. a stable community that no longer goes through major ecoogical changes
- 10. destruction of forests
- 12. the variety of life in the world or in a particular habitat
- 14. plants and animals that have migrated to places there not native
- 16. too many people in an area
- 18. a system of interlocking and independent food chains