Geologic Time: Usgs General Information Product (Paperback) (ISBN-13: 9781288678716)

The Earth is very old 4 1/2 billion years or more according to recent estimates. This vast span of time, called geologic time by earth scientists, is difficult to comprehend in the familiar time units of months and years, or even centuries. How then do scientists reckon geologic time, and why do they believe the Earth is so old? A great part of the secret of the Earth's age is locked up in its rocks, and our centuries-old search for the key led to the beginning and nourished the growth of geologic science.

Author: William L. Newman
ISBN-10: 1288678711
ISBN-13: 9781288678716
Publisher: Bibliogov
Language: English
Published: 01/30/2013
Pages: 28
Format: Paperback
Weight: 0.15lbs
Size: 9.69h x 7.44w x 0.06d