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AD
refers to dates after Jesus's birth
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BC
refers to dates before the birth of Jesus of Nazareth
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BCE
refers to "Before Common Era," dates before the birth of Jesus of Nazareth
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CE
refers to "Common Era," dates after Jesus's birth
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century
a period of 100 years
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civilization
the culture characteristic if a particular time or place
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climate
the weather conditions in a certain area over a long period of time
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Culture
the knowledge, beliefs, customs, and values of a group of people
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Custom
a repeated practice;tradition
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economy
the system in which people make and exchange goods and services
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geography
the study of the earth's physical and cultural features
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physical features
the features of the land's surface, such as mountains and rivers
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region
an area with one or more features that make it different from surrounding areas
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resources
materials found on the earth that people need and value
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society
a group of people who share common traditions
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trade
the exchange of goods and services
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