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Geologic time begins with a very long span called Precambrian Time. Precambrian Time ended about 544 million years ago. Scientists have organized geologic time into chunks. The chunks of time span different lengths. Using the model, organize the basic units of geologic time in order from longest to shortest.

Geologic time begins with a very long span called Precambrian Time Precambrian Time ended about 544 million years ago Scientists have organized geologic time in class=