Physics
The sky appears blue because of

Emision of blue wavelength by the sun
Reflection on sea water
Scattering of light
Atmospheric water vapour

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Physics
Superconductors are substances which

conduct electricity at low temperature
offer high resistance to the flow of current
offer no resistance to the flow of electricity
conduct electricity at high temperatures

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Physics
The blue colour of water in the sea is due to

Absorption of other colours except blue by water molecules
Reflection of blue sky by sea water
Reflection of blue light by impurities in sea water
Scattering of blue light by water molecules

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