Across
- 2. of Earth in which life exists, including land, water, and air or atmosphere.
- 3. layer of gases that surround Earth.
- 6. dense, trees covering a forest.
- 8. the sun's heat and light to pass through the atmosphere.
- 10. group of individuals that belong to that same species and live in the same area.
- 11. wetland formed where a river meets the sea.
- 13. seasonal changes.
- 16. of the water-salt and fresh water in the form of liquid, ice, or vapor- above or below Earth's surface and in the atmosphere.
- 19. continents, and the ocean floor, or the rocky layer.
- 22. ecosystem in which water either covers the soil or is resent at least part of the year.
- 23. homes of organisms into roughly ten different regional climate communities.
- 24. of permanently frozen subsoil.
- 25. group of similar organisms that can breed and produce fertile offspring.
Down
- 1. study of nature's "houses," organisms who live in those "houses," and interactions based on energy and nutrients.
- 4. algae.
- 5. the organisms that live in a place, together with their physical environment.
- 7. material formed from decaying leaves and other organic matter.
- 9. or nonliving, factor that shapes an ecosystem.
- 12. sunlight region near the surface in which photosynthesis can occur.
- 14. day-to-day changes in the temperature, sky or precipitation.
- 15. trees under the canopy.
- 17. living part of the environment with which an organism might interact.
- 18. the photic zone.
- 20. forests of coniferous evergreens along the northern edge of the temperature zone.
- 21. assemblage of different populations that live together in a defined area.