Chapter 1 and 13 A brief history of Earth

Chapter 1 and 13 A brief history of Earth - Chapter 1 and...

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Our solar system begins to form at about 15 billion years ago from a Nebula of hydrogen and helium let over from the big bang, as well as from heavier elements that were produced by fusion reactions in stars and/or during explosion of stars - "dust" concentrates in the inner rings, while "ice" concentrates in the outer rings. Eventually, the dense ball of gas at the center f the disk becomes hot enough for fusion reactions, leading to ignition and the thus the formation of the sun - Continuous collisions of particles leads to gradual growth of the planetesimals: an irregular shaped proto- earth develops and the interior heats up making the infant plant soft - This begins the first "chapter" of Earth's geological history: - 4.6 billion years ago - 540 million years ago Split up into: Hadean, Archean, and Proterozoic First part of Precambrian A lot of what is known of Earth's Hadean derives from study of lunar rocks and impact features… The earth was very dynamic and hot, but with internal differentiation…
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This document was uploaded on 05/05/2011.

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Chapter 1 and 13 A brief history of Earth - Chapter 1 and...

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