Across
- 2. Armed conflict causing massive destruction
- 4. Emission of energy causing harm to life
- 6. Conflict involving nuclear weapons
- 9. Imagined state with great suffering or injustice
- 12. Complete disappearance of a species
- 13. Day of the world's destruction
- 14. Period when many species die out
- 15. Widespread deadly infectious disease
- 16. Process of causing so much damage it can't be repaired
- 18. Increase in Earth's average temperature
- 19. Devastating epidemic disease
- 20. Sudden event causing great damage or loss of life
Down
- 1. Catastrophic event marking the end of the world
- 3. Complete destruction or obliteration
- 5. Large-scale violent event in the natural world
- 7. Collision of a large space rock with Earth
- 8. Extreme scarcity of food
- 10. Long-term alteration of temperature and weather patterns
- 11. Final battle between good and evil
- 17. Sudden breakdown or failure