Clouds are caused mainly by the adiabatic cooling of air below,its dew point.
On the basis of appearence,the clouds can be identified as
1) Cirrus Clouds :Cirrus clouds are high ,white and thin .They are composed of ice crystals.They form delicate patches and gives a fibrous and featherty appearance.
II) Cumulous clouds : have a flat base abd have the appearance of rising domes. hese clouds are often described as having cauliflower structure
lll) Stratus clouds: as sheets of layer that covers much or all of the sky.
Iv) Alto and Nimbus are the two prefixes which refer to middle level clouds and low clouds of considerable thickness with dark grey appearence respectively