Physics
Pieces of camphor placed on water move about rapidly. This is because of

Diffusion
Viscosity
Capillarity
Surface tension

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Physics
Why does bleeding occur through the nose in high mountainous regions ?

The blood pressure fluctuates and finally decreases drastically
The blood pressure of a person increases at high altitudes
The pressure at high altitudes is greater than that on the plains
The pressure of blood in capillaries is greater than the outside pressure

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