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d. Clouds With Extensive Vertical Development. The vertically developed clouds are
called cumulus and cumulonimbus. The height of their anges from as low as 1,500 feet to

slightly more than 10,000 Tops in a fully developed cumulonimbus cloud may be higher
than 50,000 feet. clouds with extensive vertical development are definite indications of
unstable air. The towering cumulus cloud is a common example of a vertically developed
cloud.