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Spontaneous Combusting Coal is caused by coal reacting with oxygen. When coal is exposed to oxygen it get warmer, when they is no circulation this heat builds up. Eventually this will catch fire.

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Hay is dried before storage so that the bacteria that causes the fire can not grow on the hay. Famers also have fans that circulate the air to keep the hay cool.

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Spontaneous Combustion is preventable by not strong any hay or coal in bulk and making there is room for air circulation when they are stored.

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The most common materials this happens to is coal and hay.

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Spontaneous Combustion is the outback of fire without any application of heat