I don't know whether this is the best way of phrasing it , but the statement is true.
North Korea is a dictatorship, and the government is not allowing medical aid from abroad because they don't want to loose their control of the territory.
They also don't use the methods of farming found in other places and which proved to be more efficient.
Answer:
A. They are extremely difficult to extinguish because fuel obviously is abundant and oxygen can enter easily, even through joints in surrounding rock.
Explanation:
Coal bed fires refers to spontaneous combustion which are triggered by human activity (mining), lightning, wildfires etc.
This usually happen underground when the coal beds are exposed to oxygen as a result of mining activities or human induced fires or combustion.
