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Across
  1. 3. we should use ______ fertilizers for agricultural purpose
  2. 5. pollutants from rivers, lakes, seas, and oceans make water ________
Down
  1. 1. Listening to loud sounds for a long time can cause ________ problems
  2. 2. Aquatic life struggles to breathe because of oil ________
  3. 4. Soil is held in place by the ________ of trees