11. The most severe volcanic eruption in this area occurred in the 5th century AD when the Mayan cities . 12. The closest rival to Angkor, the Mayan city of Tikal in Guatemala, was between in total size. 13. How entire civilizations _ like the lost Mayan city of Tikal _ can disappear when the surrounding ecosystem is destroyed. 14. Archaeological evidence suggests that ancient Mayan city -states felt compelled to fight cyclic 20-year wars against each other. 15. The results of ball games also were believed to have political and economic implications for the members of different Mayan cities . 16. Freeman said the radar technology will next be used in Central America, where researchers hope to find previously undiscovered Mayan cities . 17. The development has spread down the coast to the Mayan city of Tulum, which is fast becoming a busy tourist destination. 18. "Mayan cities have been in constant war, with their constructions dedicated to the gods and the heavens," 19. Its buildings have features of the R�o Bec, Chenes ( Mayan city ) and even the Puuc style from the north. 20. In the Yucatan Peninsula, two examples of capilla abiertas can be found in the former Mayan cities of Dzibilchaltun and Oxtancah.
