Ch 2.4 Part 1

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Across
  1. 4. Security Protecting nature
  2. 5. Number of people
  3. 6. System for watering crops
  4. 8. What comes out of a river
  5. 9. changes over time
Down
  1. 1. Growing food
  2. 2. Harmful substances
  3. 3. Too much water on land
  4. 7. Large water areas