Across
- 3. Made up of freshwater
- 6. Much larger than an ecosystem
- 12. Movement of sediment from one place to another
- 13. 3 percent of Earth's water
- 14. 1 year
- 16. Coal, natural gas, and oil
- 17. Weather over a long period of time
- 18. Group of plants and animals that depend upon each other and the environment
Down
- 1. Any material in nature that people use and value
- 2. Water, soil, trees, plants, animals
- 4. The home of a plant or animal
- 5. Nonrenewable resources formed form the remains of ancient plants and animals
- 7. Large streams of surface seawater moving heat around the Earth
- 8. The short-term changes in air
- 9. 24 hours
- 10. The clearing of all trees, primarily for farmland
- 11. Process by which rock is broken down
- 15. Blow in the same direction over large areas of Earth