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  3. 7th Class
  4. Social Science

7th Class Social Science Sample Paper Social Science Sample Paper - 1

  • question_answer
                                                                                                                           
    Give reasons:                                                                                                                            
    (i) Ocean water is salty.
    (ii) The quality of water is deteriorating.

    Answer:

    (i) Ocean water is salty as it contains large amount of dissolved salts.
    (ii) The quality of water is deteriorating because industrial effluents and untreated water of industries get mixed into streams and rivers. Sewage water also gets mixed into these water bodies.     


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