Spelling the <s> sound

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Across
  1. 1. The natural things you can see around you, like mountains and trees.
  2. 6. Something that can happen or be done.
  3. 8. Almost the same, but not exactly.
  4. 10. A curved shape like a thin moon.
  5. 11. A look on your face that shows how you are feeling.
  6. 13. To struggle or compete by trying to hold or push another person.
  7. 15. A group of parts that work together.
  8. 18. The reason why something is done or exists.
  9. 19. Important or having a big effect.
Down
  1. 2. An answer or reaction to something.
  2. 3. A person who studies and learns about how the world works.
  3. 4. A conversation where people share their ideas.
  4. 5. To do something again and again to improve.
  5. 7. Making no sound at all.
  6. 8. When something is important and not a joke.
  7. 9. When you are allowed to do something.
  8. 12. To shine or sparkle when light hits something.
  9. 14. Something that is easy and not complicated.
  10. 16. Something that happens quickly and without warning.
  11. 17. A part of your body that helps you move.