Chapter 19 Ecosystems

Crossword

schmied/nowak©2006

 

Across

2. A region dominated by a climax community of deciduous trees, which lose their leaves every autumn

3. Area where oceans containing saltwater and rivers containing fresh water mix

7. Process of gradual change from one community of organisms to another

8. A portion of the shoreline that is covered with water at high tide and exposed to the air during low tide

10. A region with lush, green plant growth which is the most important climax community and has the most biodiversity in the world

14. The final stage of ecological succession for a community

15. A layer of permanently frozen soil

16. A region dominated with climax communities of grasses in temperate and tropical areas

17. The first community of organisms to move into a new environment

 

Down

1. A cold, dry, treeless region, sometimes called a cold desert, where winters are six to nine months long

4. Succession that occurs in an area that has soil and previously had living plants and animals

5. Ecological succession that first begins in a place that does not have soil

6. Amount of water that condenses and falls to Earth in the form of rain, snow, sleet, hail and fog

9. A cold region of cone-bearing evergreen trees, including pines, firs, hemlocks, spruces and cedars

11. A region which receives less than 25 cm of rain each year and supports little plant life

12. Large geographic areas that have similar climates and ecosystems

13. Microscopic algae, plants, and other organisms that float near the surface of water

 

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