Question

what is the meaning of qualitative decline

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Answer 1

The main causes for qualitative decline in the purity of water resources are as follows: ... 2- Industrial waste- This includes wastes discharged from factories, refineries into the water bodies. These wastes contains harmful chemicals such as alkalis, acids etc. and toxic metals like mercury, arsenic etc.

Answer 2

it is a type of feeling that we express by associative with tge subjective quality like pain , smell, taste, image etc