Oceans 1

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Across
  1. 5. synthetic matter found as micro and macro pollutant
  2. 6. instrument that measures hotness
  3. 7. vast water bodies on earth
Down
  1. 1. a physical factor rising threat to the environment
  2. 2. instrument that measures specific gravity
  3. 3. a factor that indicates salt content of a water body
  4. 4. high concentrations of substances that are harmful