space medium MCQ

Io's tenuous SO₂ atmosphere is sustained primarily by _______.

  1. Outgassing from volcanoes
  2. Sublimation of surface frost
  3. Solar wind sputtering
  4. Cometary impacts

Answer: Outgassing from volcanoes

Io's extreme volcanism continuously replenishes SO₂ atmosphere against loss to Jupiter's magnetosphere; plumes reach 500 km altitude depositing fresh frost.

Topic Solar System - Atmospheres
Exam Relevance SSC CGL, UPSC Prelims
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