anonymous
  • anonymous
Which of these can vary in length of time? century decade millennium era
History
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
An era can vary in length of time because it can refer to a short span a of time, such as a monarch's reign or a long span of time, such as the Mesozoic Era.
anonymous
  • anonymous
That's right^, a century is 100 years. A decade is 10 years and a millennium is 1000 years.

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