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Why is there a danger of explosion in places like coal mines where there are large quantities of powdered, combustible materials?

Why is there a danger of explosion in places like coal mines where there are large quantities of powdered, combustible materials?
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Why is there a danger of explosion in places like coal mines where there are large quantities of powdered, combustible materials?

User Harshit Hiremath
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Because a spark from machinery may cause the flammable materials to ignite, or explode.
User Grovina
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