Across
- 4. Large landform that rises above its surroundings
- 6. Warm-blooded vertebrate with feathers
- 7. Opening in the Earth's crust that allows molten lava to escape
- 10. Visible mass of water droplets or ice crystals
- 13. Tall plant with a trunk and branches
- 14. Insect with colorful wings
- 16. Tall plant with a large, yellow flowerhead
- 18. Lush and dense forest with high rainfall
- 20. Arid land with little vegetation
Down
- 1. Optical phenomenon with a spectrum of colors
- 2. Natural satellite that orbits the Earth
- 3. Cascading flow of water from a height
- 5. Natural flowing watercourse
- 8. Natural underground chamber or passage
- 9. Dense and extensive area with trees
- 11. Vast body of saltwater covering most of the Earth's surface
- 12. Luminous celestial body visible in the night sky
- 15. Colorful plant structure that blooms
- 17. Large body of water surrounded by land
- 19. Sandy or pebbly shore by the ocean or a lake