crossword puzzle

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