Question

All of the followings are atmospheric layers except.

• A. Mesosphere
• B. Troposphere
• C. Asthenosphere
• D. Thermosphere

Answer 1

Answer: (C)

Asthenosphere

The atmosphere of Earth is a layer of gases surrounding the planet Earth that is retained by Earth's gravity. The troposphere is the lowest portion of Earth's atmosphere. It contains approximately 80% of the atmosphere's mass.

In the mesosphere, temperature decreases with increasing height. The stratosphere is the second major layer of Earth's atmosphere, just above the troposphere and below the mesosphere. It is stratified in temperature, with warmer layers higher up and cooler layers farther down. The thermosphere is the layer of the Earth's atmosphere directly above the mesosphere and directly below the exosphere. Within this layer, ultraviolet radiation (UV) causes ionization.

The asthenosphere is the highly viscous region of the upper mantle of the Earth. It lies below the lithosphere, at depths between approximately 80 and 200 km below the surface.

Thus, the correct answer is option C.