by 
Mawgan
ANSWERS: 4
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untill it explodes haa i dont know
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It could stay that way for 100 years or more. A guy just blew himself up from a civil war cannon ball. It really depends on what type of explosive was used and were it is in terms of whether it's buried and in what. Even if it's just laying out in the open it might be good for 100 years or more. Mines in water have been known to still be active from WWI.
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Until it detonates or its explosive components become inert. Many years if not decades.
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The safest assumption is indefinitely, i.e. until it either detonates or is disarmed by an ordinance disposal expert.
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