The Lithosphere and the Tectonic System

The Lithosphere and the Tectonic System -...

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The Lithosphere and the Tectonic System  This chapter introduces the grand cycle of plate tectonics. This cycle explains how the  continents and ocean basins of the earth's surface slowly change as forces deep within  the earth cause vast tectonic plates to converge, collide, split and separate. The solid earth has a layered structure: a dense, metallic  core  surrounded by a  mantle  of ultramafic rock which is covered by a  crust  with mafic rocks exposed  on the ocean floor and felsic rocks exposed on the continents.  Geologists use the term  lithosphere  to refer to the earth's outer layer of rigid,  brittle rocks which extend through the crust to the upper mantle. Beneath it lies  the  asthenosphere ; the layer of soft, plastic rock in the mantle.  The history of the earth can be subdivided into various time intervals using the  geologic time scale
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This note was uploaded on 11/10/2011 for the course GEA GEA2000 taught by Professor Wong,faith during the Fall '09 term at Broward College.

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The Lithosphere and the Tectonic System -...

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