Answer Posted / chetan
Clouds usually look gray when we are directly underneath
them. This is because sunlight does not shine directly on
the bottom of clouds, but rather shines through the tops of
clouds.
Sunlight gets blocked more when the cloud is thicker. So
the bottom of the cloud looks dark. If the cloud is thin,
it may appear more white because there is less cloud matter
to block sunlight.
If you are under a tall dark cloud, wait until it passes,
and look at it's side. The side of the cloud will be
illuminated by sunlight, and thus all white. So, the
brightness of the cloud (white versus gray or black) has a
lot to do with where you are standing and the thickness of
the cloud.
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