Which Atmosphere term is correctly associated with classification or zone: “the lowest major atmospheric layer”, and also with “extends from the surface to the tropopause”?

Correct Answer: Option A — Troposphere. Troposphere is correct because it is the lowest major atmospheric layer. Troposphere is also associated with extends from the surface to the tropopause. A further identifying fact is that Troposphere is temperature generally decreases with height. Another useful fact is that Troposphere is associated with most weather phenomena occur in it. Why the other options are incorrect: Option B — Stratosphere: It is the layer above the troposphere and is associated with extends from the tropopause to the stratopause; those are the identifying facts of Stratosphere. Option C — Mesosphere: It is the layer above the stratosphere and is associated with extends to the mesopause; those are the identifying facts of Mesosphere. Option D — Thermosphere: It is a very thin upper atmospheric layer and is associated with lies above the mesopause; those are the identifying facts of Thermosphere. Exam Takeaway: Link Troposphere with “the lowest major atmospheric layer” and “extends from the surface to the tropopause” for quick revision.