Early Humans and the Rise of Civilization Crossword

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Across
  1. 4. In which age was fire discovered?
  2. 5. who used irrigation to provide a stable food supply?
Down
  1. 1. Neo-Babylonians made advances in the field of astronomy and what other field?
  2. 2. When did people learn how to domesticate animals and grow crops for food?
  3. 3. Ancient Mesopotamians established the first city along what river?