Which of the following statements is/are correct about clouds?
a. Cloud is a mass of minute water droplets or tiny crystals of ice formed by the condensation of the water vapour in free air. b. The clouds are formed at some height over the surface of the earth, they take various shapes. c. When the temperature of an air mass containing a large quantity of water vapour falls all of a sudden, condensation takes place within itself on fine dust particles forming clouds.
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