crossword puzzle

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