The borders of the Roman Empire, which fluctuated throughout the empire's history, were realised as a combination of military roads and linked forts, natural frontiers (most notably the Rhine and Danube rivers) and man-made fortifications which separated the lands of the empire from the countries beyond.
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A-1. In this image old rusted tin cans and other iron rusted utilities are there.
A-2. When iron is exposed to oxygen and water or water vapour for longer period of time, it rusts.
A-3. To prevent rusting follow these 2 methods:
Explanation:
The borders of the Roman Empire, which fluctuated throughout the empire's history, were realised as a combination of military roads and linked forts, natural frontiers (most notably the Rhine and Danube rivers) and man-made fortifications which separated the lands of the empire from the countries beyond.
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