Idioms are difficult to understand because their meaning is not what it appears to be at first sight. Some are easier to guess when they have some association with the original meaning of the ...

Different colors have different wavelengths of light. Violet and blue have the shortest wavelengths ... a sunset will look like. If the sky is full of clouds and overcast, from the ground you ...

The colour of the sky is determined by the scattering of the sun's light rays as they pass ... the sun's rays), and these pink clouds superimposed on a dark blue sky. The combination of pink ...