What was one of the achievements of the Aztecs in engineering?

The achievement of creating a double aqueduct is a significant demonstration of the Aztecs’ advanced engineering skills, particularly in their ability to manage water resources in a challenging environment. The aqueduct was essential for transporting fresh water from springs in the mountains to the city of Tenochtitlan, which was situated on an island in Lake Texcoco. This accomplishment reflects their sophisticated understanding of hydraulics and civil engineering, as they constructed a complex system to ensure that the city's population had access to clean water.

The use of a double aqueduct indicates a level of ingenuity and foresight in city planning, allowing for both efficiency and redundancy in water supply. This was critical for maintaining the health and livelihood of the population. The engineering behind the aqueduct system not only served practical purposes but also demonstrated the societal organization and technological capabilities of the Aztec civilization.

The other choices, while related to significant achievements in their respective fields, do not apply to the Aztecs. The first pyramids in the Americas were built by earlier Mesoamerican cultures such as the Olmecs and the Maya. The invention of concrete materials is attributed to ancient Romans, rather than the Aztecs, who used locally available materials for construction. Additionally, mechanical clocks