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The atmosphere is divided into five layers. It is thickest near the surface and thins out with height until it eventually merges with space. The layers from lowest to highest :

- The Troposphere (up to 10 km) It's the atmosphere that surrounds us. On top of that comes...

- The Stratosphere (10-50 km) Very little oxygen or water vapor. Aircraft fly in the lower stratosphere. This is also where the ozone layer exists. On top of that comes...

- The Mesosphere (50-80 km) This is where most meteors burn up, because the density is higher than the outer layers. On top of that comes...

- The Thermosphere (80-650 km) Practically a vacuum. Includes the ionosphere (auroras) as well as space station orbits. On top of that comes...

- The Exosphere (500-2000 km) The farthest any of Earth's atmosphere exists.

Based on charged particles and not necessarily gas molecules, some atmospheric models combine the Exosphere into the Thermosphere, making the outermost layer the Magnetosphere, a vast region where atmospheric ions interact with the solar wind in space.

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8y ago

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