Physics
The sky appears blue because of

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

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Physics
Which of the following options correctly explains the term heat budget?

It is the amount of heat which the surface of earth receives from the sun.
It is the radiation from the earth in the form of long waves.
It is a mode of transfer of heat through matter by molecular activity.
It is the balance between incoming and outgoing radiation

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