Mesopotamia inventions

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Across
  1. 3. using river water for farming
  2. 5. fancy way of saying math
  3. 6. a way to use a boat with the wind
  4. 7. another word related to tire
Down
  1. 1. used in buildings, made of clay
  2. 2. you use a pencil to do this
  3. 4. a version of playing a game
  4. 5. something like a globe