What effect do clouds have on the color of the sky?

Question

They absorb light waves.
They transmit light waves.
They reflect light waves.
They scatter light waves.

Answer 1

Clouds have the effect of scattering light waves in the atmosphere, which can dramatically affect the color of the sky. This scattering causes the shorter wavelength blue and violet light waves to be scattered in all directions, giving the sky its blue color. On cloudy days, the clouds can scatter all visible wavelengths of light, making the sky appear white or gray.