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Q: Which of the following gases is consistently seen to be most abundant in a volcanic eruption?
  • A. Water vapour
  • B. Carbon Dioxide
  • C. Sulphur Dioxide
  • D. hydrogen Sulphide
Correct Answer: Option A - By far the most abundant volcanic gas is water vapor, which is harmless. However, significant amount of Carbon Dioxide, Sulfur Dioxide, Hydrogen Sulfide and Hydrogen halides can also be emitted from volcanoes.
A. By far the most abundant volcanic gas is water vapor, which is harmless. However, significant amount of Carbon Dioxide, Sulfur Dioxide, Hydrogen Sulfide and Hydrogen halides can also be emitted from volcanoes.

Explanations:

By far the most abundant volcanic gas is water vapor, which is harmless. However, significant amount of Carbon Dioxide, Sulfur Dioxide, Hydrogen Sulfide and Hydrogen halides can also be emitted from volcanoes.