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Note that the possible height of cloud varies with location and airmass, so the highest cloud can occur in the tropics, the lower heights (with cirrus possible at 10,000 ft or 3500 m) in polar regions.
The bottom of the cloud is known as the cloud base and the top is the towering part of the cloud. The towering part, in a cumulonimbus cloud known as a towering cumulonimbus, is what is able to grow. They're not flat on the bottom. You should see a ceilometer trace some time.