Across
- 1. 28. elements that organisms need to sustain life.
- 6. 26. _________________ activities affect cycles on a global scale through mining, burning fossil fuels, etc.
- 8. 30. nitrogen ____________________ is when certain types of organisms (or lightning) convert nitrogen gas into a solid that can be stored in the soil.
- 11. 12. the process by which plants and other organisms capture light and use it to take in carbon and produce their own food.
- 16. 1. Our entire planet with all of its organisms and physical environments.
- 17. 5. An assemblage of different populations that live together in a defined area.
- 20. 6. All the organisms that live in a place together with their physical environment.
- 21. 24. ____________________ processes include volcanic eruptions, formation and breakdown of rock, and major movements of matter below Earth's surface.
- 26. 31. some bacteria obtain energy by converting nitrates into nitrogen gas, which is released into the atmosphere in a process called __________________________.
- 27. 7. a group of ecosystems that share similar climates and typical organisms.
- 28. 11. primary ____________________ are the first producers of energy rich compounds in an ecosystem that can be used by other organisms.
- 30. 15. organisms that rely on eating other organisms for energy and nutrients.
- 31. 27. water that is absorbed into the soil and stored underground.
Down
- 2. 19. _______________________ pyramids are models that show the relative amount of energy or matter contained within each trophic level in a food chain or web.
- 3. 25. physical and ___________________ processes include cloud formation and precipitation, the flowing of running water, and the action of lightning.
- 4. 14. acquire energy from other organisms, usually by eating them.
- 5. 10. capture energy from non-living sources (the sun, chemicals, etc.) and convert it into forms living cells can use.
- 7. 2. the scientific study of interactions among organisms populations, and communities and interactions with their environment.
- 9. 20. the total amount of living tissue in a given trophic level.
- 10. 17. a food _________________ is a network of feeding interactions through which both energy and matter move.
- 12. 21. a pyramid of ____________________ is a model that shows the relative number of individual organisms at each trophic level for a single ecosystem. (a single ecosystem may be as small as a single tree).
- 13. 16. a food ___________________ is a series of organisms in which energy is transferred from one organism to another.
- 14. 3. a group of similar organisms that can breed and produce fertile offspring.
- 15. 13. chemical energy stored in chemical bonds is used to produce carbohydrates for energy.
- 16. 23. _____________________ processes consist of any activities performed by living organisms.
- 18. 22. _____________________________ cycles are cycles in which matter flows from one trophic level to another and elements are recycled within and among ecosystems.
- 19. 18. a _____________________ level is each step or level in a food chain or web.
- 22. 8. living thing.
- 23. 32. The ____________________ nutrient is any nutrient whose supply limits productivity or continuing reaction.
- 24. 29. when organisms die, ________________________ usually break down their bodies.
- 25. 9. non-living thing.
- 29. 4. a group of individuals that belong to the same species and live in the same area.