Which Atmosphere term is correctly associated with key feature: “temperature rises greatly as high-energy radiation is absorbed”, and also with “auroras occur mainly in this region”?

Correct Answer: Option C — Thermosphere. Thermosphere is correct because it is temperature rises greatly as high-energy radiation is absorbed. Thermosphere is also associated with auroras occur mainly in this region. A further identifying fact is that Thermosphere is temperature rises greatly as high-energy radiation is absorbed. Another useful fact is that Thermosphere is associated with auroras occur mainly in this region. Why the other options are incorrect: Option A — Exosphere: It is particles are extremely sparse and is associated with light gases such as hydrogen and helium dominate. Option B — Ozone layer: It is absorbs much of the Sun's harmful ultraviolet radiation and is associated with its depletion increases surface UV exposure. Option D — Jet stream: It is mainly flows from west to east and is associated with it strongly influences weather systems and aviation routes. Exam Takeaway: Link Thermosphere with “temperature rises greatly as high-energy radiation is absorbed” and “auroras occur mainly in this region” for quick revision.