Across
- 4. ülerahvastatus
- 7. Estonian Museum of Natural History
- 10. a squirrel that can glide in the air
- 11. rain happevihm
- 12. tasakaal
- 14. prolonged period of abnormally low rainfall
- 15. kliima soojenemine
Down
- 1. liik endangered species
- 2. osoonikiht
- 3. the trapping of the sun's warmth in a planet's lower atmosphere
- 5. biolagunev
- 6. nature reserve
- 8. release of a liquid petroleum hydrocarbon into the ocean
- 9. an area of land with a group of energy-producing windmills or wind turbines
- 13. solution