Physics
The law of conservation of energy states that

Energy can neither be created or destroyed
Energy can neither be created nor destroyed
Energy can either be created or destroyed
Energy can either be created nor destroyed

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Physics
The blue colour of sky is due to

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

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