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Eras are longer than, and made up of, periods, in the same way that decades are longer than and made up of years. For example, the Mesozoic era is made up of the Triassic, Jurassic and Cretaceous periods, in the same way that the 1990s is made up of 1990, 1991, 1992, 1993... etc.
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Related questions
What are the basic divisions of the Geologic Time Scale from larger to small?
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Geological eras can be divided into .?
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