Describe the various layer of atmosphere
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The layers are troposphere,stratosphere, mesosphere and thermosphere. A further region beginning about 500 km above the Earth's surface is called exosphere.
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LAYERS OF THE ATMOSPHERE
The atmosphere can be divided into layers based on certain characteristics of the air at different levels.
- TROPOSPHERE ---- the troposphere is the lowest layer and also the most related to life on Earth. The troposphere extends upwards for about 8 km to 16 km. Most weather phenomena are noticed here.
- STRATOSPHERE ----- extending to about 50 km above the troposphere, the stratosphere is important because of the ozone layer. This layer protects us from the lethal ultraviolet rays of the Sun.
- MESOSPHERE ----- the mesosphere, which extends above the stratosphere, is where many meteors get burnt as they enter the Earth's atmosphere. This stretches to about 85 km.
- THERMOSPHERE ------ the thermosphere that also includes the ionosphere, overlaps the mesosphere and continues to about 640 km. The ionosphere is important as its electrified molecules or ions make radio and television wave transmission possible. All satellites are, therefore, stationed in this layer.
- EXOSPHERE ------ beyond the thermosphere/ ionosphere is the exosphere, which is made up of extremely rarefied air. It extends to about 10,000 km. Space stations are located at its lower margins. The exosphere merges with outer space.
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