How many eras, eons are there? 11 periods
What are the differences between eras and eons? Eons were the first longest division of geologic time and eras is the second long and distinct period.
Why did scientist create eras and eons? They made it to divide things in to separate time frames .
What were three major geological events in history of the earth? Ice Age, Dinosaurs being extinct, Humans on earth.
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