Final answer:
The island of Tenochtitlán was connected to the mainland of Teotihuacan through large causeways built using pylons driven into the marshy land and covered with stone and rock.
Step-by-step explanation:
Tenochtitlán, the island city of the Aztecs, was connected to the mainland of Teotihuacan through large causeways.
These causeways were built using pylons driven into the wet marshy land, which were then covered with stone and rock.
These causeways provided a means of travel on foot between the island city and the mainland.