Aincient macepotamia 9 questions

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Across
  1. 1. How many Base 60 Systems are there?
  2. 6. How long has Mesopotamia existed?
  3. 7. Which Empire observes the stars?
Down
  1. 2. What is the name of the old code they spoke?
  2. 3. How many langueges has adapted from Hamamarabi?
  3. 4. What big thing did they build?
  4. 5. How many BC before now, has the tablet describing a sale of land?