What process causes the sky (lower tropopause)to appear blue in colour?

Question

Quizplus · Accepted Answer

The blue color of the sky is caused by the scattering of sunlight by the atmosphere. When sunlight enters the Earth's atmosphere, it encounters tiny particles, such as air molecules and dust, which scatter the light in all directions. Blue light is scattered more than other colors because it travels as shorter and smaller waves. This scattering of blue light creates the appearance of a blue sky.

What Process Causes the Sky (Lower Tropopause)to Appear Blue in Colour