Seven (7) importance of earth’s atmosphere.

The Atmosphere can be defined as the gaseous envelope surrounding the earth.
Atmosphere can also be defined as a grand body from the earth surface to the outer space and composed of number of gases.
The estimated mass of the atmosphere is 5.6 x 1014 metric tones. It extends over about 400 km height and meteorological events and effects occur in it. The thickness of gaseous envelope is equal to 1% of the earth’s mean radius.


Usefulness of the atmosphere:

  • It fulfills the biological oxygen demand (BOD) of the animal life. 
  • It supplies the necessary precipitation or moisture.  
  • It protects the biological life on the planet from harmful extraterrestrial radiations like UV, by absorbing it though ozone.  
  • It maintains the warmth of the planet through its green house effect, avoiding the temperature to fall to too extreme limits.(The earth’s temperature in the absence of atmosphere would have been +950C (day),and -1450C (Night)  
  • It provides the necessary CO2 which is basic input required to run photosynthesis process in plants to build biomass.  
  • It provides the necessary medium for the transport of pollen. Seeds spores and insets. Many physical chemical and hydrological processes responsible for weather and climate occur in atmosphere only.  
  • Atmosphere is a big reservoir of nitrogen. Some plants and microbes can fix this nitrogen for plant growth eg, Azolla pinara Azotobacter.

Instruments and items found in every weather station. 

 Prominent features of stevenson screen.

Causes and effects of sea and land breeze.


Five (5) general characteristics of tropical desert climate.

Four (4) general characteristics of tropical mansoon climate.

Three (3) types of rainfall.

Ten (10) types of clouds.

Six (6) effects of climate on human activities.

Difference between Greek system and Koppen’s system of climate classification.

Classes and procedures used to classify airmasses.

The whole mechanism of cloud formation. – July 23, 2015

Nine (9) characteristics of arid areas in East Africa.

Seven (7) types of fog.


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