Across
- 3. Planet named after sea god
- 4. King of the jungle
- 8. Landform lower than mountain
- 9. Planet with tilted axis
- 11. Flat expanse of land
- 14. Negative particle orbiting nucleus
- 16. Striped African animal
- 18. Large inland body of water
- 20. Icy body with a tail
- 21. Dry, barren area of land
- 22. Vast body of salt water
- 27. Shooting star
- 29. Neutral particle in nucleus
- 30. Striped big cat
- 31. Large coastal inlet
- 32. Our home galaxy
- 33. Molecule carrying genetic code
Down
- 1. Largest planet in solar system
- 2. Basic unit of life
- 5. Planet with rings
- 6. Positive particle in nucleus
- 7. Large natural watercourse
- 10. Smaller body of salt water
- 11. Once considered a planet
- 12. Organ that pumps blood
- 13. Rigid organ in vertebrates
- 15. Low area between hills
- 17. Smallest unit of matter
- 19. Large elevated landform
- 21. River mouth landform
- 23. Rock orbiting the sun
- 24. Organ used for breathing
- 25. Organ that controls body
- 26. Huge system of stars
- 28. Coastal body of water