Physics
Oil rises up the wick in a lamp because

Of the surface tension phenomenon
Oil is very light
Of the capillary action phenomenon
Of the diffusion of oil through the wick

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Physics
The blue colour of sky is due to

Refraction of sunlight
Scattering of shorter wavelengths of sunlight in the atmosphere
Reflection of sunlight
Scattering of longer wavelengths of sunlight in the atmosphere

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