The Atmosphere

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What is the layer of the atmosphere in which we live?

This is the densest layer of the atmosphere and cantains almost 90% of the atmosphere's mass.

This layer lacks particle density and although it has very high temperatures, it is not very hot.

As altitude increases,

The coldest layer, where temperature decreases as altitude increases is known as.

Auroras are caused by electrically charged particles in the

What causes differences in air temperature at different altitudes?

What are the two highest layers of the atmosphere?