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Across 1. A symbiotic relationship when both species benefit from the relationship 7. year-after-year atmospheric changes 9. The ____ zones have seasons and the angle of the sun changes throughout the year. 11. decaying organic matter that fertilizes soil 13. permanently frozen soil 14. a climate in a small area that differs from the climate around it 16. the atmospheric gases that keep the Earth warm are _____ gases 18. free-floating or weakly swimming organisms 20. Anything that is essential for life 22. A symbiotic relationship when one species is helped and the other is harmed 23. another name for the Boreal Forest 24. The place where any organism lives 25. the _____ zone is the part of the ocean that producers can grow

Down 2. another name for the small plantlife in a rainforest 3. the top layer of a rainforest 4. cold areas where the sun shines at a low angle are ___ zones. 5. Living things in an ecosystem are called ____ factors 6. day-to-day atmospheric changes 8. Non-living things in an ecosystem are called ____ factors 10. A symbiotic relationship when one species is helped and the other is neither helped nor harmed 12. trees that have thin leaves shaped like needles are ____ 15. organisms that live in the pitch black part of ocean 17. the _____ zone is the part of the ocean that is permanently dark 19. The ____ zone is between 23.5 N and 23.5 S latitude 21. the _____ ocean extends from the low-tide mark to the outer edge of the continental shelf