Class 10- 12 Notes PDF Download Hindi Medium

Class 10- 12 Notes PDF - Click Here
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Class 10 to 12 Notes PDF Download Now

वातावरण या पर्यावरण मे उत्पन्न वह अवांछित परिवर्तन, जो सजीवी तथा पर्यावरण पर प्रतिकूल प्रभाव डालता है, प्रदूषण कहलाता है।

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