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season. Each layer has a, hange in composition and, pause., , tt of these layers vary aT, , oe ae =, H, , I its place. 450 t, , , ®, $ THERMOSPHERE, portant layer of the atmosphere =, breathe exists in this | 80 km = Jeno eee i:, p ayer. It also t “Geiss, , , , , , , , MESOSPHERE —, , particles, smoke, soot and ash as, ses present in the atmosphere, ed in this layer. It extends upto, he poles, as it is coldest at the, is compressed. It extends upto a., equator, because the air is hottest an, - expands. Water vapour and dust, are present in this layer, so all the weather phenomenon like rainfall, fog, hailstorm, is layer., , 50 km , 1, =, , ree, , ase cone, Ozonosphet, , lavers of atmasnhere, , e the troposphere and extends upto 50 km. The temperature remains constant, of 20 km and above. Upper limit of this layer is called stratopause. This layer is, 4s it contains ozone gas which protects us from the harmful ultraviolet radiations., Iso free from clouds and related weather conditions, therefore it is ideal for, , the height of 80 km and lies just above the stratosphere. It is the coldest layer, phere. The upper limit of mesosphere is called mesopause. Mesosphere has, a Mee chine in the night as they are made up of costiG dust. Meteorites burn in, n they enter the atmosphere. Most of the meteorites from the space turn into, , ching the Earth’s surface., , g0 km to 500 km. Its lower part has electricallylayer is also called Lonosphere. Radio waves, , d back by this layer. It helps in facilitating, Thermosphere protects us from meteor, , dextends from, fore, this, re reflecte, , unication., , e mesosphere an, es called ions. There, smitted from the Earth a, Jese ana satellite comm, , , , , 205.