Ch1,9- lecture notes JUST 9

Ch1,9- lecture notes JUST 9 - Chapter 1, 9 Early history of...

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Chapter 1, 9 Early history of Earth
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Evolution of Earth From chunks of rocks to a layered body
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1. Earth heats up and melts Sources of heat 1. Impact: Collision of planetesimals with primitive Earth. The energy of motion (kinetic) was converted into heat. A giant impact caused Earth to melt. It’s believed that the moon formed from the ejected debris. 2. Radioactive decay: of potassium, uranium, and lithium
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Artist’s image: Collision of a large Mar- sized body with Earth about 4.5 b.y. ago
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Origin of the moon (Fig. 9.4)
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Meteor Crater, Arizona Created by meteor 50,000 years ago Craters are rare on Earth’s surface because most of them have been erased by geological processes.
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As a result of giant impact, a large part of Earth melted Light material floated to the surface crust Heavy material sank to center core Material of intermediate density settled between the crust and the core forming the mantle. The core is mostly made of iron and a small
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This note was uploaded on 05/04/2008 for the course GEOL 1001 taught by Professor Baksi during the Fall '07 term at LSU.

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Ch1,9- lecture notes JUST 9 - Chapter 1, 9 Early history of...

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