The vocabulary challenge

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Across
  1. 4. A large vehicle that can take you to space
  2. 7. A large vehicle that moves on rails and goes underground
  3. 8. A large vehicle that can move many people
  4. 10. A cold blue planet
  5. 12. A small vehicle that has two wheels
  6. 15. The last planet in our solar system
  7. 18. A large vehicle that can fly
  8. 19. An outdoor activity done with a horse
Down
  1. 1. The first planet in our solar system
  2. 2. The largest planet in our solar system
  3. 3. An outdoor activity done in the forest
  4. 5. An outdoor activity done in the ocean
  5. 6. Known as the red planet
  6. 7. Our star
  7. 9. An unknown vehicle that flies
  8. 11. A planet with rings of ice and rock
  9. 13. An outdoor activity done in the mountains
  10. 14. A small vehicle that has four wheels
  11. 16. The only planet with life
  12. 17. A large vehicle that moves on rails