The measurement of geologic time is of much importance outside of the realms of geology and biology. Closely related to the history of sedimentary rocks are the age of the Earth as an astronomical ...

Precambrian time covers the vast bulk of the Earth's history, starting with the ... Time The Precambrian is the earliest of the geologic ages, which are marked by different layers of sedimentary ...

Jimmy Carter, the 39th president of the United States, died Sunday at the age of 100. Though he served only one term in ...