Which benefit resulted when Aztec chinampa agriculture extended into saline lake Texcoco shoreline?

💡 Explanation

When chinampas reached saline areas, naturally occurring halophilic cyanobacteria in the soil performed nitrogen fixation because of their adaptation to high salinity, thereby enriching the soil with available nitrogen. Therefore nitrogen fixation through bacteria results, rather than reduced methane, natural pest control, or greater phosphorus which are enabled by different mechanisms.

• Which structural risk increases when differential settlement occurs in a ziggurat's foundation due to variations in soil composition?
• Which benefit resulted from Mesoamerican civilizations constructing chinampas in shallow lake beds?
• Which outcome occurred when hillside terrace construction exceeded soil cohesion limits in ancient Andes?
• Which consequence resulted from inadequate terrace wall drainage in ancient hillside agriculture?
• Which phenomenon allowed Ibn al-Haytham (Alhazen) to accurately describe image formation in his 'Book of Optics' (Kitab al-Manazir)?
• Which mechanism allowed Roman fortifications like Hadrian's Wall prevent breaches despite lacking deep foundations?