Across
- 4. two or more individuals or populations try to use the same resource
- 6. the bubbles in the crest of a breaking wave
- 8. the change of substance from a liquid to a gas
- 9. the lowest layer of the atmosphere
- 12. the burning of a substance
- 14. the study of the interactions of organisms with one another and with their environment
Down
- 1. a wetland ecosystem in which shrubs and trees grow
- 2. living elements in the environment
- 3. tiny organisms that float near the surface of the water
- 4. the change of gas to liquid
- 5. the movement off air caused by air pressure
- 7. a mixture of gases that surrounds a planet or moon
- 10. a grassland with very few trees
- 11. the amount of water vapor in the air
- 13. smoke and fog