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Did you know?
The reason many ancient Roman structures have survived this long is that the Romans used volcanic ash in their concrete. This concrete, when exposed to seawater, forms crystals of aluminum tobermorite that strengthens it over time. Modern scientists have been studying this phenomenon for at least a decade.
![Picture Roman Structures Have Survived This Long Because Romans Used Volcanic Ash In Their Concrete](https://unbelievable-facts.com/wp-content/uploads/2022/03/roman-structures-450x300-c-default.jpg)
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