The outermost region of the atmosphere, based on composition, is the
A) homosphere.
B) heterosphere.
C) troposphere.
D) thermosphere.

Question

Quizplus · Accepted Answer

The heterosphere is the outermost region of the atmosphere, based on composition. It is characterized by a variation of layers with different compositions of gases, which separates it from the homosphere where the gas composition is well mixed. The heterosphere includes the thermosphere, which is the layer where high-energy radiations from the sun interact with atmospheric particles, causing ionization and the formation of the aurora borealis or northern lights.

The Outermost Region of the Atmosphere, Based on Composition, Is