Water

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Across
  1. 3. they are dug up to obtain ground water
  2. 5. the large-scale introduction of manufacturing, advanced technical enterprises, and other productive economic activity into an area, society, country
  3. 6. a wise and careful use of resources
  4. 7. a barrier constructed to hold back water and raise its level
Down
  1. 1. water found below the water table
  2. 2. the cutting down of trees
  3. 4. a large natural or artificial lake used as a source of water supply.