The Origin of Life - The Origin of Life 1. Formation of...

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The Origin of Life 1. Formation of Earth a. Planetesmal model of planet formation (see illustration) i. Individual chunks of rubble known as planetesmals ii. Planetesmal collisions occurred: 2 possible outcomes 1. Complete destruction of both bodies 2. mergence/fusion; the planetesmals join together a. The snowball effect would cause the mass to grow and form a planet (a body that becomes round under gravity) iii. Earth formed from cumulative planetesmal collisions. b. Proto-Earth i. Chemically homogenous, hot, semi-liquid rock (it is the same throughout) ii. Eventually differentiated c. Conditions of the Proto-Earth surface i. Initially lacked an atmosphere (journal) ii. Colossal volcanic activity on the crust surface (journal) iii. Sources for the atmosphere and ocean 1. Volcanic out gassing 2. comet collisions (journal) 2. Conditions of Young Earth’s Surface ca. 4 billion years ago a. Oceans exist (fresh water) (journal: Why is it salty now? River deposition) b. Crust c.
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This note was uploaded on 09/14/2011 for the course BIO 1001 taught by Professor Staff during the Fall '08 term at Cornell University (Engineering School).

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The Origin of Life - The Origin of Life 1. Formation of...

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