| Abstract: | 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. |
| Genre: | USGS Unnumbered Series |
| ProdID: | 70039221 |
| Citation Author: | Newman, William L. |
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| Citation Language: | English |
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| Citation LatN: | 0900000 |
| Citation LatS: | -0900000 |
| Citation LonE: | 1800000 |
| Citation LonW: | -1800000 |
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| Citation Number Of Pages: | 24 |
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| Citation Phsyical Description: | 22 p. |
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| Citation Publisher: | Government Printing Office |
| Citation Series: | General Information Product |
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| Citation Search Results Text: | Geologic time; 2000; USGS Unnumbered Series; Newman, William L. |
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| Citation Year: | 2000 |
| Type: | citation/reference |
| Text: | Geologic time; 2000; USGS Unnumbered Series; Newman, William L. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/gip/70039221/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/gip/70039221/report.pdf |
| Date Other: | Sat, 1 Jan 2000 14:38 -0600 |
| Publisher: | Government Printing Office |
