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The divisions of geological time, known as geologic time scales, are not standard lengths like 100 million years because they are based on significant events in Earth's history, such as mass extinctions and major geological changes, rather than a uniform passage of time. These divisions reflect the complex and uneven nature of Earth's geological and biological evolution. Additionally, the varying rates of sedimentation, tectonic activity, and biological development contribute to the irregular lengths of these divisions. As a result, some periods may last millions of years while others may only last a fraction of that time.

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