Gases Commonly Encountered in Underground Mines (16)
Progress Indicator:
Question 1 of 20
1. __________ may be found anywhere, but is most likely to be encountered in virgin coal, roof cavities, high places, abandoned workings, and places that are improperly ventilated.
Choices:
- Carbon Dioxide
- Sulfur Dioxide
- Methane
- Hydrogen Sulfide
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