Precambrian - Research Article from World of Earth Science

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Precambrian

In geologic time, Precambrian time encompasses the time from Earth's formation, approximately 4.5 billion years ago, until the start of the Cambrian approximately 540 million years ago (mya). Because the Precambrian is not a true geologic eon, era, period, or epoch, geologists often refer to it as Precambrian time (or simply, Precambrian). Precambrian time represents the vast bulk of Earth's geologic history and covers nearly 90% of Earth's history.

Although scientists do not yet know all the exact steps by which the earth formed, cooled, and took on its approximate shape and physical characteristics, a good deal of reliable evidence can be inferred from studies that concentrate on the formation of landmass, oceans, and atmosphere. Astrophysical data—and theories of physics that explain the evolution of physical law and nucelosynthesis—make these studies of Earth's formation both possible and reliable because the same laws of physics and chemistry that...

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This section contains 474 words
(approx. 2 pages at 300 words per page)
Buy the Precambrian Encyclopedia Article
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World of Earth Science
Precambrian from World of Earth Science. ©2005-2006 Thomson Gale, a part of the Thomson Corporation. All rights reserved.
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