Across
- 3. organisms in the wrong environment
- 8. poisonous precipitation
- 9. dirty clouds
- 10. out of control algae
- 11. huge collection of trash in the ocean
- 12. a hole in the atmosphere
Down
- 1. the Earth's temperature is changing
- 2. accidentally making a desert
- 4. a ship with oil has an accident
- 5. chemicals and waste going into rivers
- 6. cutting down large areas of trees
- 7. catching too many fish