The Mayans, the Aztecs and the Incas Crossword Puzzle

QUESTIONS LIST: hieroglyphics : this writing system was believed to be the only complete writing system in mesoamerica, writing : what type of system are hieroglyphics?, rope bridges : the incas built these to connect the mountains in their territory, place value : the mayans developed this concept along with the concept of zero, medicine : in order to treat various ailments and injuries, the aztecs used native plants to create this, freeze drying : what method did the incas use to freeze their food?, highway systems : the incas built these to connect their territory, khipus : this device is a series of strings tied with knots used by the incas for communication, machu picchu : this city was made by the incas which made them famous for their engeneering skills, mayans : which ancient civilization developed the concept of zero?, calendar : this highly complex devise was developed by the mayans to keep track of the days and months accurately, chocolate : the aztecs used the cacao bean to make this treat, aztecs : this ancient civilization were the first people to use the cacao bean to make chocolate, floating gardens : these were built by the aztecs as an ingenious method of farming, incas : which ancient civilization used cold temperatures of the andes mountains to freeze food?