In shallow mines, the major contributing factor to the direction of natural ventilation is:
A. Underground temperature
B. Surface temperature
C. Underground temperature as well as by surface temperature
D. No definable dependence on the underground temperature and/or the surface temperature
Answer:B
In shallow mines, the major contributing factor to the direction of natural ventilation is:
A. Underground temperature B. Surface temperature C. Underground temperature as well as by surface temperature D. No definable dependence on the underground temperature and/or the surface temperature