Question

The region of the atmosphere above 400 km and higher is known as
a. Exosphere
b. Mesosphere
c. Thermosphere

Answer 1

The region of the atmosphere above 400 km and higher is known as Exosphere 

Answer 2

The correct answer is option (a) Exosphere.

• The exosphere may want to be a skinny, atmosphere-like quantity encompassing a planet or herbal satellite at any place molecules square measure gravitationally sure to that body, however anyplace the density is for this reason low that the molecules square measure essentially collisionless.
• Inside the case of bodies with sizable atmospheres, like Earth's atmosphere, the layer is the topmost layer, anywhere the environment thins out and merges with the location. it is positioned immediately greater than the layer.

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