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        | natural volcanic glass, a rock used in the past to make very sharp blades |  | 
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        | slash-and-burn agriculture |  | Definition 
 
        | a farming method in which trees and other plants are cut down and burned |  | 
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        | a period of very little or no rain |  | 
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        | a symbol that stands for a word, idea, or sound |  | 
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 | Definition 
 
        | buildings for observing the sky |  | 
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        | a wall to hold back water across the middle of a lake. |  | 
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        | a system in which one person from a ruling family has unlimted powers |  | 
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        | canals or pies that carry fresh water |  | 
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        | a member of any people under Aztec influence |  | 
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        | A member of a Mesoamerican Indian people inhabiting southeast Mexico, Guatemala, and Belize |  | 
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        | people who lived in rainforests in Mexico |  | 
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        | a peninsula of Central America between the Gulf of Mexico and the Carribean |  | 
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        | ruined city of Zapotec culture |  | 
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