কোন কোন কারণ গুলি সিন্ধু নদীর তীরে হরপ্পা সভ্যতার শহরগুলি গড়ে ওঠার প্রযোজ্য ছিল
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Sedimentation is the tendency for particles in suspension to settle out of the fluid in which they are entrained and come to rest against a barrier. This is due to their motion through the fluid in response to the forces acting on them: these forces can be due to gravity, centrifugal acceleration, or electromagnetism.
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the process by which plant prepare their own food with the help of Sunlight is known as photosynthesis
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