/y/ saying 'i' in Pyramid

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Across
  1. 3. An old story people used to tell to explain nature or life.
  2. 4. Something from a myth, like a dragon or unicorn.
  3. 5. A country in Africa with pyramids and pharaohs.
  4. 9. A word that means the same as another word.
  5. 11. A place where people go to exercise or play sports.
  6. 12. A sport where people do flips, balance, and jumps.
  7. 14. Something that stands for or represents an idea.
  8. 15. A part or beat of a word, like in “ba-na-na”.
  9. 16. A word that means the opposite of another word.
  10. 17. A picture or shape that stands for something, like a heart for love.
  11. 18. A story or problem that needs to be solved.
Down
  1. 1. Hard to explain or full of secrets.
  2. 2. A 3D shape with a square base and four triangle sides. Found in Egypt.
  3. 6. A science that explains how things move and work.
  4. 7. Words to a song.
  5. 8. A clear or shiny rock that can form in shapes.
  6. 10. A group of old stories about gods and heroes.
  7. 13. The green part in plants that helps them make food from sunlight.