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clouds ![click to hear : clouds click to hear : clouds](../../images/speaker-vert.gif)
Fine droplets of water or ice crystal suspended in the atmosphere; the World Meteorological Organization classifies them according to 10 types.
clouds of vertical development ![click to hear : clouds of vertical development click to hear : clouds of vertical development](../../images/speaker-vert.gif)
Clouds whose base is at low altitude but extend very high; the two types are cumulus and cumulonimbus.
cumulonimbus ![click to hear : cumulonimbus click to hear : cumulonimbus](../../images/speaker-vert.gif)
Very imposing cloud that can reach a thickness of 10 km and whose base is very dark; it can trigger violent precipitation.
cumulus ![click to hear : cumulus click to hear : cumulus](../../images/speaker-vert.gif)
Fair-weather cloud with very clear contours; it has a gray, flat base and a white top with rounded protuberances.