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One of the hardest things to grasp about geologic time is how LONG a
billion years of Earth history actually is. Here are a few comparisons
to help understand the concept of a million and a billion:
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A million sheets of paper would form a tower as high as a 30-storey building.
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A billion-page stack (1000 million) would be ten times higher than Mount
Everest.
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A million seconds is 21 days.
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A billion seconds is more than 31 years.
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