![]() ![]() (ii) Upper limit of the layer is called stratopause respectively. (i) Atmospheric layer above the troposphere and below the mesosphere. So all weather phenomena occur in this layer. (v) Contains three-fourth of total atmospheric gases and abundant water vapour and dust particles which leads to formation of clouds along with rains,storms,cyclones,etc. The rate of decrease in temperature is 6.5☌ per kilometre. (iv) Temperature tends to decrease with increas in altitude. ![]() (iii) Average height of the layer is 12km which extends to a maximum height of 16km at the equator and 8km at the poles. (ii) Upper limit of this layer is called tropopause where the temperature remains constant. (i) Bottom-most layer of the atmosphere that remains close on the earth’s surface. Q.3: Write with diagram about the layers of the atmosphere based on the variations in altitude and temperature and write the characteristics of each layer in brief.Īns: Based on the variations in altitude and temperature,the layers of the atmosphere are divided into troposphere, stratosphere,mesosphere, thermosphere and exosphere. (d) Hydrogen layer (beyond 3540km to the extreme boundary of the atmosphere at about 10,000km) (iv) Based on the variation in the atomic masses of the gases,certain gases remain unevenly concentrated in this layer and form different sub-layers,which fall under the thermosphere and exosphere. (iii) Density of air is negligible low in this region whereas there is spectacular rise in temperature. (ii) Extends beyond 80km to about 10,000km. (v) Based on attitude,the layer is further divided into troposphere, stratosphere and mesosphere. (iv) There is uniformity in the composition of various gases throughout the homosphere. (iii) 99% of the atmosphere elements is confined to within 32 km of the homosphere. ![]() (ii) Extends upto an attitude of 80 km from the earth’s surface. ![]() The characteristics of these layers are : Q.2: What are the main layers of the atmosphere based on chemical composition of the gases ? Write briefly about the characteristics of these layers.Īns: The main layers of the atmosphere based on chemical composition of the gases are homosphere and heterosphere. ![]()
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