Why icicles are formed rough ( wavy)?

This is because, when in the process when the water from the roof begins to drain, during a severe frost, these drops turn into little icicles. n n as soon as the water continues to flow down the icicle, formed a new wave in the form of ice, which creates bumps on the icicle. n n this happens until all water from the roof does not drain and icicle at the same time, will be even greater.
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