Answer:
farming on chinampas
Step-by-step explanation:
A chinampa is an ancient Mesoamerican method of agriculture and territorial expansion that, through a species of rafts covered with soil, served to cultivate flowers and vegetables, as well as to expand the territory on the surface of lakes and lagoons of the Valley of Mexico; making Mexico-Tenochtitlan a floating city. They used them for agriculture and gain ground in the lake waters.