Across
- 6. Young person between 13 and 19.
- 7. Self-assured or certain.
- 11. One thousand million or a large number.
- 13. Arid land or to abandon.
- 15. Large marine mammal.
- 16. Relationship between friends.
- 17. All of space and everything in it.
- 18. Study of Earth's features.
- 19. Unit of mass.
- 20. Ability to recall or computer storage.
Down
- 1. Astonishing or very impressive.
- 2. Cardinal direction.
- 3. To observe an event with festivities.
- 4. Very old or from long ago.
- 5. Electrical discharge in the sky or something very fast.
- 8. Land surrounded by water.
- 9. Cause or logic.
- 10. Reptile or to move sinuously.
- 12. Person living next door.
- 14. Ruler of an empire.