জলদূষণ (Water Pollution) -: জলদূষণের সংজ্ঞা :- জলের সঙ্গে কোনো অবাঞ্ছিত পদার্থ মিশে যাওয়ার ফলে যদি জলের ভৌত, রসায়নিক ও জৈব বৈশিষ্ট্যের পরিবর্তন হয় এবং তার ফলে জলজ উদ্ভিদ, প্রাণী …
There is, one knows not what sweet mystery about this sea, whose gently awful stirrings seem to speak of some hidden soul beneath; like those fabled undulations of the Ephesian sod over the buried Evangelist St. John. And meet it is, that over these sea-pastures
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There is, one knows not what sweet mystery about this sea, whose gently awful stirrings seem to speak of some hidden soul beneath; like those fabled undulations of the Ephesian sod over the buried Evangelist St. John. And meet it is, that over these sea-pastures
There is, one knows not what sweet mystery about this sea, whose gently awful stirrings seem to speak of some hidden soul beneath; like those fabled undulations of the Ephesian sod over the buried Evangelist St. John. And meet it is, that over these sea-pastures
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