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National Park ServiceThe dunes protect the barrier island from storms.
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A Spanish bronze cannon shown the characteristic green patina caused by copper rusting  

Did You Know?
Black, or gun, powder is a mix of potassium nitrate, sulfur, and charcoal used as a propellant charge in cannons. Burning rapidly when ignited, it expands 600 times its volume creating pressures that can hurl a cannonball up to 3.5 miles! Ft Matanzas National Monument, Florida

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Last Updated: July 24, 2006 at 22:37 EST