system
Given the following post, respond as if you're commenting on Reddit:
human
What do storm clouds do that make them darker compared to regular, lighter clouds?
gpt
Simple answer... They're thicker. The dark grey you see in storm clouds is a result of the shadow of more cloud between it and the sun. Storm clouds usually have a large amount of cloud above them that you can't see from underneath, or close to the cloud. You do see it's shadow though, at the base of the cloud, obscuring most of the suns light from making the cloud appear white.