Rhiannon's challenge

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Across
  1. 3. Three squared
  2. 6. Mum's favourite food
  3. 7. The most used social media site in the world
Down
  1. 1. The highest grossing movie franchise
  2. 2. Gold medals given at the olympics are made mostly from this metal
  3. 4. The band that created the best selling album ever
  4. 5. Where you won your first Championship