SELECT * FROM question_mgmt as q WHERE id=4290 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=8 AND subId=16 AND chapterId=194 and ex_no='4' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 9th science Natural Resources list any three human activities which would lead t

Question:

List any three human activities which would lead to an increase in the carbon dioxide content of air.

Answer:

The following three human activities would lead to air pollution:

(i) Burning of fossil fuels like coal and petroleum.

(ii) Emission of harmful gases and dust particles from vehicles.

(iii) Smoke released from industries containing harmful gases like sulphur dioxide, oxides of nitrogen.


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  • Answered by Ekta Mehta
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  • Answered by Ekta Mehta
  • 4 months ago

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