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Height and Shape of Clouds (prefix+suffix)
high clouds (above 600 m.)
middle - elevation clouds (200-600 m.)
low clouds (below 200 m.)
clouds are dark and so full of water that sunlight can't penetrate them
smooth, even sheets or layers at low altitudes
puffy, white clouds, often with flat bases
high, thin, white, feathery clouds made of ice crystals