Across
- 4. make a clear difference
- 6. the top layer of the Earth
- 9. the Earth system that includes all living things
- 11. the Earth system that includes rocks, soil, and sediments
- 12. things that depend on each other
- 13. a collection of parts that work together
- 14. snow, hail, rain, and fog are all examples of
Down
- 1. warming of earth's atmosphere, land, and water
- 2. all the water on, under, or above earth's surface
- 3. made up of the outer, rocky parts of Earth
- 5. the layer of mixed gases that surrounds Earth
- 7. the inner most layer of the Earth
- 8. a large, swirling tropical storm
- 10. the thickest of Earth's layers