How did the aztecs modify their natural environment to develop a successful civilization centered on an island on lake texcoco?

The correct answer is to this open question is the following.

The great Aztec Empire built its capital city of the Texcoco lake. The name of the city was Tenochtitlan. They used advances engineering techniques to build "Chinampas," portions of land communicated through water channels that connected Tenochtitlan City with other close towns such as Tlatelolco (the biggest market place in Mesoamerica), or the town of Mixcoatl, in the south. They used mud, wood and rocks to make solid "Chinampas" where Aztecs lived and worked on agriculture.