Why are time periods in the geologic time scale are not even in length?
They are based on the type of fossils found in rock layers of the earth.
They are based on a different type of calendar used to track Earth's history.
They are baed on the thickness of the Earth's rock layers.
They are based on important events happened in Earth's history.
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Why are time periods in the geologic time scale are not even in length?
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