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Fires in underground coalmines usually occur due to the:  A. explosive combustion  B. deliberate combustion 

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Fires in underground coalmines usually occur due to the: 

A. explosive combustion 

B. deliberate combustion 

C. spontaneous combustion 

D. rapid combustion

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C. spontaneous combustion 

fires in underground coalmines occur due to spontaneous combustion of coaldust.

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