Chapter 4: Ecosystems and Communities

9-26-05 p.7

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Across 1. the _____ zone is the part of the ocean that is permanently dark 3. year-after-year atmospheric changes 9. decaying organic matter that fertilizes soil 10. the atmospheric gases that keep the Earth warm are _____ gases 12. The place where any organism lives 14. a climate in a small area that differs from the climate around it 15. A symbiotic relationship when one species is helped and the other is harmed 18. the top layer of a rainforest 20. Non-living things in an ecosystem are called ____ factors 21. cold areas where the sun shines at a low angle are ___ zones. 22. Anything that is essential for life 23. A symbiotic relationship when both species benefit from the relationship

Down 2. A symbiotic relationship when one species is helped and the other is neither helped nor harmed 4. The ____ zones have seasons and the angle of the sun changes throughout the year. 5. another name for the Boreal Forest 6. Living things in an ecosystem are called ____ factors 7. organisms that live in the pitch black part of ocean 8. trees that have thin leaves shaped like needles are ____ 11. another name for the small plantlife in a rainforest 13. free-floating or weakly swimming organisms 15. permanently frozen soil 16. day-to-day atmospheric changes 17. The ____ zone is between 23.5 N and 23.5 S latitude 18. the _____ ocean extends from the low-tide mark to the outer edge of the continental shelf 19. the _____ zone is the part of the ocean that producers can grow

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