A paper by De Lucia and Overholtzer argues that Xaltocan’s (“shahl-TOH-kahn”) access to this resource forced the city into paying its tribute to the Aztecs with cloth. Massive amounts of this resource were used at the site of Texcotzingo (“taysh-koht-SING-oh”), which was built to look onto a mountain believed to be the home of a deity associated with this resource. The name of this resource is combined with one for “mountain” in the Nahuatl word for city-states, āltepētl. (15[1])A structure associated with this resource at Atzacoalco is typically credited to (*) Nezahualcoyotl (“nay-sah-wahl-KOH-yoh-del”). This resource was transported to Tenochtitlan from Chapultepec Hill. Effective use of this non-plant resource is what made chinampas particularly productive. For 10 points, the Valley of Mexico lost an important source of which resource with the draining of Lake Texcoco ■END■