1)The earths atmosphere is the environment for its biological activity and exerts the considerable influence on lakes and oceans

2)The atmosphere protects the earths life by harmful radiation and cosmic debris.

3)The ozone layer protects from the sun’s harmful ultra violate rays’ seasonal holes in the ozone layer the first detected above Antarctica and Arctic in 1980s caused considerable alarm consequences of air pollution

4)Much of what makes earth exceptional depends on atmosphere

5)Without atmosphere the earth would look like moon, as atmospheric gases are important for living organisms.

6)Weather describes what atmosphere is like at specific time and place and may include temperature weather and precipitation

7)Along with ocean atmosphere keeps the earths temperature within acceptable range as greenhouse gases trap heat into atmosphere which helps in moderating global temperature

8)Water vapor which is atmospheric gas is an essential part of water cycle.

Classification of cloud and its Formation

Clouds are classified on the basis of their height shape color and transmission or reflection of light
Cloud formation:
Clouds are formed at different heights.The characteristics of clouds are formed by the elements available including the amount of water vapors temperature at the height, the wind, and interplay of other masses.

Factors influencing cloud formation:

1) surface heating :
The increase in temperature heats the ground of the air in contact with it which rises and forms clouds.
2) topography :
The shape and feature of area can cause clouds to be formed when air is force to rise over a barrier of mountains or hills it cools as it rises resulting in cloud formation.
3) frontals :
Clouds are formed when a mass of warm air rises up over a mass of cold dense air over large areas along fronts.
4) convergence :
Streams of air flowing from different directions are forced to rise where they flow together or converge
5) Turbulence : A sudden change in wind speed with height creating turbulent eddies in the air.

Classification of clouds:

1) low clouds
Clouds having their base at between sea level and 2 km height.
2) medium clouds
Clouds whose bases are between 2km and 6 km height.
3) high clouds
Clouds whose base are over 6 km above sea level.

Classification according to appearance:

1) cirrus
A silvery cloud in the form of feathers or fibers seen high up against a blue sky.
2) cumulus
A white cloud shaped like a cauliflower which can have great vertical extent.
3) stratus
An even layer of grey cloud not giving rain
4) Nimbostratus
An even layer of grey cloud giving rain.It is an original cloud type and not a combination of nimbus and stratus.