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Isaac Social Studies
|an expanse of time characterized by an individual, human, activity or culture; synonym of "age"
|an expanse of time characterized by an individual, human, activity or culture; synonym of "era"
|a system of organizing and dividing time, often based on the orbit of the moon around the earth or the earth around the sun
|a calendar system based on the earth's rotation around the sun
|a calendar system based on the moon's rotation around the earth
|the period of time before Christ was born, now referred to as "before common era"
|the period of time after Christ was born, now referred to as "common era"
|a way of showing contrasting features on a map
|a geographical region spanning Africa, Europe and Asia
|a geographical region consisting of North and South America
|a geographic region in the basin of the Pacific Ocean containing 25,000 islands
|the land mass of both Europe and Asia