13 History of the Earth, Part 1

13 History of the Earth, Part 1 - History of the Earth,...

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Unformatted text preview: History of the Earth, Part 1 01_Featured_Art.jpg Zoomable Art PC Mac Early Earth: we already know a lot • Accretion: Bombardment by meteorites • Sphericity • Differentiation • Formation of moon • Formation of magnetic field Hadean Eon • Lot of Igneous rocks • Outgassing of volatiles • Formation of atmosphere • Towards end: sedimentary rocks • Oceans? Archean Eon • End of bombardment Beginnings of ‘crust’ Is it Plate Tectonics? Proto-continents … then Cratons First Life • Undisputed signs of life • Stromatolites: algal mats • 3.2 Ga ago Other Early life? • Anoxic environments: black smokers • Photosynthesis -> need sunlight, creates Oxygen • Oxygen burning -> needs oxygen environment 13_08.jpg Proterozoic Eon •Continental crust almost as big as today •Some continental interiors form-away from collision zones Cratons formed Shields: broad low-lying regions Platforms: covered by sedimentary rocks Accretionary orogens...
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This note was uploaded on 05/05/2008 for the course GEOL 121 taught by Professor Dr.souter during the Spring '08 term at Towson.

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13 History of the Earth, Part 1 - History of the Earth,...

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