civilization - A human society with its own government and culture., generation - All of the people in a group that are around the same age., salt - A crystal used to improve the flavor of food or to preserve it., kingdom - A country or region that is ruled by a king or queen., gold - A valuable metal used for making jewelry and ornaments., empire - A number of individual nations that are all controlled by another ruler from another country., mathematican - A person who is trained in the study of math., astronomer - A person who studies the science of stars, planets, and space., system - A way of working, organizing, or doing something in a specific way., Terrace farming - Growing crops on a flat area carved from a steep area of land., domestication - Training an animal to live closely with humans.,

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