Geology 101 Class Day 3.docx

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Department
Geology
Course
GEOL 101
Professor
Alfonso Benavides Iglesias
Semester
Fall

Description
Geology101539Class3Test1TuesdaySeptember92014OutlineRecapRatesandhistoryofplatemovementsoPaleomagnetismrecordedinrocksoSeafloorasamagnetictaperecorderThegrandreconstructionoSeafloorisochronesoReconstructingthehistoryofplatemovementsMechanismofplatetectonicsoMantleconvectionsmantleplumesPlateTectonicsInvolvestheouterportionofearthcrustandtopmostpartofthemantledowntotheasthenosphereoAbout20distinctplatesoTensofkminthicknessoInrelativemotionwithrespecttoeachotherPlatemotioncausesearthquakesbuildsmountainrangesandvolcanicactivity3TypeofPlateBoundariesDivergentBoundariesoOceanicspreadingcenterRiftingandspreadingalongamidoceanridgecreatenewoceaniclithosphereMidAtlanticridgeoContinentalriftzoneRiftingandspreadingzonesoncontinentsarecharacterizedbyparallelriftvalleysvolcanismandearthquakesGreatRiftValleyConvergentoOceanOceanConvergenceWhereoceaniclithospheremeetsoceaniclithosphereoneplateissubductedundertheotherandadeepseatrenchandvolcanoisformedoOceanContinentconvergencePeruChiletrenchWhenoceaniclithospheremeetscontinentallithospheretheoceaniclithosphereissubductedandavolcanicmountainbeltisformedandthecontinentalmargin
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