Hi popz! Clouds are made up of condensed water droplets suspended in the air. Light travels slower through water then air and it is refracted (changes direction) when it comes out of the water droplets so we cant see straight through clounds. But they dont absorb any light so they look white which is what you see when you look at all the different colours together. Sometimes then can be grey or even black because there is so much water that it is stopping light getting through, and usually this means its about to rain!
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