Pollution of sea water due to the discharge of wastes into it is called marine pollution. such as oil, plastic, industrial and agricultural waste and chemical particles into the ocean.
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17.
Define chemical oxygen demand (COD).
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18.
Why is COD preferred over BOD?
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19.
Which main compounds are causing damage to ozone layer?
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20.Which disease will be caused due to hole in the ozone layer and why?