sustainability - the ability to be maintained at a certain level; avoidance of the depletion of resources, innovation - a new idea, product or method, civilization - a society marked by developed arts, sciences, government, technology and economics, social structure - the way a civilization is organized (often shows the value and responsibilities of people within this civilization), technology - tools and other inventions created for practical purposes, merchant - a person who makes money by buying and selling goods, artisan - a person who is skilled in a particular craft (craftsman), scribe - a person who writes (most people couldn't read or write in ancient times), ziggurat - an ancient Mesopotamian temple, culture - the characteristics that define a group of people such as beliefs, customs, language, food, technology, etc., cuneiform - ancient Sumerian writing that used wedge-shaped characters, pictograph - a symbol that stands for an object, archaeologist - a scientist that studies past cultures through the objects they left behind, ritual - a special ceremony using sacred actions, words, and objects (something that is performed in a certain way each time),

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