Across
- 3. Bright flash in the sky during a storm
- 5. Earth's natural satellite
- 10. Loud sound during a storm
- 12. Severe weather with rain and wind
- 14. Colorful part of a plant
- 15. Water falling from the sky
- 17. Low area between hills
- 19. Blue expanse above
- 20. Tall plant with leaves
Down
- 1. Large body of saltwater
- 2. Brightest star in the sky during the day
- 4. Fluffy white formation in the sky
- 6. Frozen water falling from the sky
- 7. High land formation
- 8. Celestial body visible at night
- 9. Moving air
- 11. Vast expanse of saltwater
- 13. Colored arc in the sky
- 16. Large natural stream of water
- 18. Green ground cover