Which natural feature is the closest to the city of Rome?
A. the Tiber River
B. the Adriatic Sea
C. the Tyrrhenian Sea
D. the Apennines

the tallest building in the western hemisphere and the sixth tallest building in the world

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).