A Wonderleaf question

a real page from the book
Clouds look white because sunlight hits countless tiny water drops and scatters in every direction, so all the colors reach our eyes mixed together. They look gray when the cloud is thicker, because less sunlight gets through to the underside we can see.
A rain cloud can have a bright top and a gloomy bottom at the same time. From above, sunlight may still be shining strongly on it, while people underneath stand in the cloud’s own shade, seeing a darker belly.
Shine a flashlight through a clear glass of water, then add a splash of milk and compare how the light changes.
Watercolour scenes, straight answers, about three minutes cover to cover.
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