Environmental Science Crossword

1. A sulfur-containing amino acid used in protein formation.
3. The second most abundant element in organisms by mass.
4. The process where bacteria convert nitrates into nitrogen gas.
5. Rain Rain that becomes harmful because of pollutants in the atmosphere.
7. A community of organisms interacting with their environment.
12. Cycle The cycle that moves phosphorus through ecosystems.
14. The study of weather and the atmosphere.
15. The study of relationships between organisms and their environment.
16. Organisms that produce their own food.
17. Excessive growth of plants and algae caused by too many nutrients.
20. Water found beneath Earth's surface.
21. Cycle The cycle that moves carbon through living and nonliving systems.
23. Tide The study of harmful algal blooms caused by excessive algae growth in water.
25. The role of an organism in its environment.
27. Organisms that get energy by eating other organisms.
28. An element needed by organisms that enters living systems from the atmosphere.

2. The movement of water from plants into the atmosphere.
3. The science that studies chemicals and their effects on the environment.
4. The process that returns sulfate to soil, ocean, and atmosphere through organisms.
6. Fixation The process of changing nitrogen gas into ammonia.
8. Runoff The flow of water over land from rain or melting snow.
9. The variety of living organisms in an area.
10. The science that studies living organisms.
11. The air layer surrounding Earth where gases are found.
13. Cycle The cycle that describes the movement of water on Earth.
18. Weathering The breakdown of sulfur-containing rocks by natural processes.
19. The protection and careful use of natural resources.
22. Organisms that break down dead materials.
24. The study of Earth's physical features and processes.
26. A place where a substance is stored naturally in the environment.