OCR Text |
Show The color of a cloud depends on the manner in which the sunlight falls upon it and the position posi-tion of the observer. It will be noticed that high clouds are always white or light in color, and this is because the light by which they are seen Is reflected re-flected from the under surface by the numberless drops of moisture, which go to form the cloud. Heavy rain clouds, on the other hand, are found much nearer the earth, and so the light falls on them more directly from above, giving a silver lining to the cloud, though the under surface ap-.. pears black, owing to the complete reflection and absorption of the light by the uppor layers. Seen from above by an observer in a balloon the blackest black-est rain clouds appear of the most dazznng brilliant bril-liant white. |