Competitive Exams: Clouds

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Clouds are huge collections of water vapour. They are formed by very minute suspended water particles present in the air or in some cases, when there is very low temperature, they are formed by huge collections of very small crystal-like structure of snow. Clouds are of different types.

  1. Cumulus: These are huge white masses of clouds shaped like cauliflower or like great billows of fluffy wool.

  2. Cirrus: These are thin, feathery wisp-like clouds formed very high up in the sky. They do not bring rain or snow. They are dry or rainless. These are formed usually at levels of 5, 000 to 14, 000 metres.

  3. Nimbus: These are heavy, dark, grey or black, quite thick, and found at low heights.

  4. Strata: These are low sheets of layer of clouds. They are spread horizontally from one side of the horizon to the other. They cause drizzle or light rain.

Fog: It is a thin cloud-like formation at the surface of land or water. It spreads in the lower layers of the atmosphere, when the temperature of these layers fall below the dew point.

Mist: Like fog, ii is also formed on account ot1the fall of the temperature of air. Here the droplets of water formed on account of condensation are heavier than those of the fog; therefore, mist is always seen close to the earth, and does not rise up so high as the fog.