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After world war 2, many people moved from the cities to?

According to the article about the zhou dynasty, this dynasty was broken into different eras because its capital changed from place to place. how many different eras were there in the zhou dynasty? a. two b. six c. ten d. fourteen

Ascientist makes a map using gis. one layer is an aerial photograph of farmland. other layers show water level changes and how crop cover has changed over time. what might the scientist be studying?