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layers of the atmosphere

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layers of the atmosphere
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  • Today we will be talking about the 4 layers of the atmosphere. The troposphere, stratosphere, mesosphere, and thermosphere.
  • The troposphere- is the part we live in. In this part of the atmosphere the temperature gets colder as the distance above the earth increases, by about 6.5°C per kilometer. The top of the troposphere is called the tropopause. This is lowest at the poles, where it is about 7 - 10 km above the Earth's surface. It is highest (about 17 - 18 km) near the equator.
  • The stratosphere extends upwards from the tropopause to about 50 km. It contains much of the ozone in the atmosphere. The increase in temperature with height occurs because of absorption of ultraviolet (UV) radiation from the sun by this ozone. Temperatures in the stratosphere are highest over the summer pole, and lowest over the winter pole.
  • The mesosphere is the region above the stratosphere is called the mesosphere. Here the temperature again decreases with height, reaching a minimum of about -90°C at the "mesopause".
  • The thermosphere lies above the mesopause, and is a region in which temperatures again increase with height. This temperature increase is caused by the absorption of energetic ultraviolet and X-Ray radiation from the sun. The region of the atmosphere above about 80 km is also caused the "ionosphere"
  • Thank you for joining me today and discussing about the 4 layers of the atmosphere, which you a great day!
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