• The troposphere is the lowest and most important layer of the atmosphere.
  • All of Earth’s weather takes place in the troposphere.
  • The troposphere gets some of its heat directly from the Sun.
  • Most, however, comes from Earth's surface.
  • The surface is heated by the Sun and radiates back into the air.
  • This makes the temperature higher near the surface than at higher altitudes.
  • An inversion can trap air pollution near thesurface.
  • A temperature inversion is when air is cooler close to the ground than it is above.
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