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Unformatted text preview: 3) When cirrus clouds are above a deck of altocumulus clouds, occasionally a clear area or "hole" will appear in the altocumulus cloud layer. What do you suppose this happens? 4) When falling snowflakes become mixed with sleet, why is this condition often followed by the snowflakes changing into rain? 5) Clouds that form over water are usually more efficient in producing precipitation than clouds that form over land. Why?...
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- Winter '09
- Precipitation, #, Water vapor, Atmospheric Sciences