How is venice connected to the mainland of italy?

Venice is connected to the mainland of Italy by the Venice Railroad Bridge and a road causeway named the Ponte Della Liberta, (Bridge of Freedom).

The peak above is part of the  sierra madre occidentals ,  a chain of volcanic mountains that runs through the middle of central america. 

Humans have survived and thrived in mexico city by using technology to create greater access to land. when the spanish conquered the aztec capital, tenochtitlan, in the 16th century, they built mexico city by draining the lakes and filling in the lake water to create more arable land for agriculture. this technique of land reclamation has continued to be fundamental to human civilization in mexico city.