Mars and Earth

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Across
  1. 2. likely to be true
  2. 6. next
  3. 8. an important idea
  4. 12. space between two places
  5. 13. how hot or cold something is
  6. 16. very big
  7. 17. almost the same
  8. 19. a large body of salt water
Down
  1. 1. things that are not the same
  2. 2. time that has gone
  3. 3. correct ✔
  4. 4. a unit to measure temperature
  5. 5. turned into ice
  6. 7. how long something is
  7. 9. almost
  8. 10. a talk to share ideas
  9. 11. also
  10. 14. to discover something new
  11. 15. a long distance
  12. 18. some