Early Humans

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Across
  1. 2. Always on the move
  2. 4. Sumerian writing
  3. 6. Old stone age
  4. 7. Tin+Copper
Down
  1. 1. "Hill of heaven"
  2. 2. New stone age
  3. 3. They were the only ones to survive the ice age.
  4. 5. "The land between two rivers"