Mysteries of Matter

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Across
  1. 2. Who is supposed to melt snow?
  2. 3. Who gnaws on wall?
  3. 6. A flowing fluid
  4. 7. What trapped Hormiguita?
  5. 9. To become a liquid because of warmth
  6. 14. What happens in a story
  7. 16. The people in a story
  8. 17. The state of something
  9. 19. How hot or cold it is
  10. 21. To become solid because of cold
Down
  1. 1. Who keeps sun from melting snow?
  2. 2. Hard and firm
  3. 4. Who pushes cloud?
  4. 5. The material something is made of
  5. 8. Who blocks the wind?
  6. 10. Plot is made up of these
  7. 11. To catch
  8. 12. The way something is at a certain time
  9. 13. What measures hot or cold
  10. 15. When something happens
  11. 18. Who makes hot chocolate?
  12. 20. To change something