Maharashtra State PSC Model Paper 3

The correct answer is 1, 2, and 3.

• Natural sources of sulfur dioxide:
  • Volcanic eruptions release large quantities of sulfur dioxide into the air.
  • The vast quantities of sulfur dioxide released during one eruption can be enough to alter the global climate.
  • Similarly, hot springs release sulfur dioxide into the atmosphere.
  • Sulfur dioxide can even be produced by the reaction of hydrogen sulfide with the oxygen in the air.
  • Hydrogen sulfide is released from marshes and regions in which biological decay is taking place.
• Hence option 1 is correct.