5 - very runny (low viscosity) All abyssal plains are 5 km...

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03:16 Plate Tectonics:  Eq. Belts define edges of about a dozen large, thin, rigid tectonic plates that  cover the earth. Plates are made up of lithosphere—100 km thick Move relative to one another by sliding on a weak, softer layer called the  aesthenosphere All tectonic activity (mountain building-Greek for “builder”)  Eqs, volcanoes, mountains occurs at boundaries of tectonic plates Three types of plate boundaries: (SEE DIAGRAMS) 1. Divergent-move away from each other Ex: Mid-Atlantic Ridge Iceland is the only place where the Mid-Atlantic ridge comes to the surface 2. Convergent-move towards each other 3. Transform-move past each other horizontally Type of Magma   Basalt, erupted at mid ocean spreading centers, dark colored, 
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Unformatted text preview: very runny (low viscosity) All abyssal plains are 5 km deep Shield Volcano, Iceland Low slopes because of the low viscosity of the magma The Red Sea & East African Rift SystemExamples of continental Rifting SEE DIAGRAM Plates are not always exclusively continental or oceanic, some plates can be both Olduvai Gorgeimportant because it is where some early discoveries were made Lucy-early human evolution Hominids The Atlantic and Indian Ocean Floor Niger Failed Rift Arm (aulochogene) Failed rifts are where continental rifting began, but then failed to continue to the point of break-up Niger River- failed rift arm Mississippi embayment New Madrid Eqs 03:16 03:16...
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This note was uploaded on 10/06/2010 for the course GEOL 240Lxg at USC.

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5 - very runny (low viscosity) All abyssal plains are 5 km...

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