NATURE

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