Physics
Second and third class levers are differentiated by

The presence of multiple loads
The location of the fulcrum
The type of fulcrum present
The location of the load

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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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