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How do you call a billion year time period?
It COULD be called a Gigayear, but in practice it is simply called "a billion years".
What do you call term for 1000 years?
It is a millennium that is equivalent to a thousand years.
What do you call a period of 25 years?
A period of 25 years is called a "quarter-century." This term is derived from the fact that a century is made up of 100 years, so a quarter-century represents a quarter of that time span. It is commonly used in various contexts, such as history, planning, and forecasting.
How many millions are one billion?
It depends on where you live. In the US there are a thousand millions in a billion. In Great Britain, what Americans call a billion is called a thousand million, and there are ten thousand millions in a British billion, or what Americans call a trillion.
What is a ten-thousand sided polygon called?
Without careful, precise, lab-grade measurement, anyone who looked at it would call it a "circle".
