John wesley powell, who led the first boat trip through the grand canyon, called the feature marked by the yellow lines above "the great ". what did he put in the blank?

This photo shows an early mesoamerican structure, specifically from the zapotec culture. what was this structure most likely used for? a.creating terraces for farm fieldsb.practicing religious ceremoniesc.playing a ball game with stone hoopsd.protecting a city from invading armies