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Why does bleeding stop by rubbing moist ...

Why does bleeding stop by rubbing moist alum?

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Why does bleeding stops by rubbing moist alum?

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Why does nose start bleeding on high mountains?

Radha and Meera are fast friends. They both study in class XII. Radha is a student of science while Meera follows commerce stream. One day, when they were playing, Radha got hurt and started Fluiding. Merra took to her house and applied some alum on the cut. The bleeding stopped immediately. (i) Why bleeding stopped when some alum is applied on the cut ? (ii) What are the values associated with Meera's decision to take Radha to her house and apply alum on her cut ?

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It is difficult to stop bleeding from a cut in human body at high altitude. Why?