Physics
The wall of a dam is made thicker at the bottom than at the top because the pressure exerted by the water on the wall

Increases with depth of the wall
Depends on the area of the wall
Depends on the thickness of the wall
Increases with height of the wall

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Physics
The blue colour of sky is due to

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

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