The earth.

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Theory of Plate Tectonics

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Presentation transcript:

The earth

3d Structure of the earth.

Crust less dense than what is below it. Etc… Mohorovicic Discontinuity (Moho) – where the density increases at the bottom of the crust. Boundary between the lithosphere and aesthenosphere Note, reverse topography at bottom of crust.

Note relative thicknesses of the crust Note relative thicknesses of the crust. Also note that the lithosphere includes the crust and a bit of the upper mantle.

Oceanic crust Oceanic (mafic) rocks. Continental (felsic) rocks Denser than felsics Darker colored Less silica, more iron/Mg basalt Continental (felsic) rocks Lighter than mafics Lighter colored More silica, less iron/Mg. Granite

Plate tectonics The crust of the earth is, basically, a bunch of pieces floating around on the asthenosphere. These plates interact, forming surface topography http://factsanddetails.com/world/cat51/sub323/item2212.html - an excellent overview of plate tectonics. Might be a good thing to read while studying.

Continent – continent convergence

Ocean-ocean convergence

Ocean-continent convergence

C-C to O-O divergence

Transform boundary

http://earthquake. usgs.gov/earthqua kes/feed/v1.0/kml. php

San Andreas in CA

Goto google earth and look at all types of plate boundaries

Talk about hot spots Hawaii and the Galapagos Columbia plateau, snake river plain, yellowstone

The Rock Cycle