Crater Lake - GEOSC 10 Thursday January 21st 1999...

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GEOSC 10 Thursday, January 21st, 1999 Announcements: First writing assignment is due Tuesday, January 26 th ; turn in two copies of writing assignment Lecture notes: Review Tectonic process = continental rifting Related Topics Oceanic rifting Formation of ocean floor Lithosphere plates Continental vs. oceanic rocks Continental rocks have a lower density and are a white, light color like granite; oceanic rocks have a higher density and are a darker color Formation of earth (accretion, heat) Convective cooling – density driven, thermally controlled process of moving rock materials; it’s what makes lithosphere plates move (between 1 and 10 cm/yr.) Accretion of meteorites (coming together) _________________________________________________________________ ___ I. Crater Lake A. Wizard Island is in the middle of the lake; magma that is shaken up and oozes up to the surface to create an island in the center; develops a resurgent dome; island continues to get bigger and will eventually blow off B.
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