Across
- 1. When nature recovers after something is destroyed
- 3. Changing to meet a need
- 4. An animal that eats dead animals left behind
- 5. The study of interactions of living things in the environment
- 6. Animals that eat both plants and meat
- 9. Shows the flow of energy through an ecosystem
- 14. All the different food chains connected together in one place
- 16. Hot, melted rock that comes out of the Earth
- 22. Animals that eat only meat
- 24. An animal whose presence changes how the whole ecosystem works
- 25. The order of who eats who in nature
- 28. Organisms that eat dead plants and animals and break them down
- 29. A huge rock from space that can hit Earth
- 30. When water vapor cools down and forms clouds
- 31. A big, sudden event in nature that can cause destruction to an area
- 32. When plants start growing on bare rock for the first time
- 33. The cycle that moves nitrogen from air to soil through bacteria
- 34. Animals that only eat plants
Down
- 2. A community that has stopped changing and is fully grown
- 7. The way oxygen moves through the air and into living things
- 8. Anything that is alive
- 10. When water turns into an invisible gas and floats up into the air
- 11. Anything that is not alive (like rocks, water or air)
- 12. The path that carbon takes as it moves through nature and living things
- 13. A living thing that makes its own food using sunlight
- 15. An animal or plant from another place that causes problems in a new home
- 17. The way bacteria help put nitrogen from the air into the soil
- 18. All the different types of life in one area
- 19. All the living and nonliving things in one area and how they interact
- 20. A long time with very little rain
- 21. Water that falls from clouds as rain or snow
- 23. A first plant or animal to live in a bare, empty are
- 26. An animal or plant that naturally belongs in an area
- 27. A big, uncontrolled fire in forests or grasslands
- 30. A living thing that eats other living things