GEO 1111 Lecture Notes - Lecture 6: South American Plate, North American Plate, Eurasian Plate

• School: University of Ottawa
• Department: Geology
• Course: GEO 1111
• Professor: Robert Jack Cornett

Document Summary

New crust is created but the earth is not getting larger === new ocean crust must be destroyed and also be creates. Mantle convention may cause or effect of circulation set up by. Downward pull" motion of subducted crust into the mantle ( like coller dense water sinking inot the ocean) Pushing of crust resulting from elevravted position of ocencei ridge sytem == casuing crust to gravitationally slide down flanks of ridge. The earth"s surfa(cid:272)e is (cid:272)urre(cid:374)tl(cid:455) (cid:271)roke(cid:374) up i(cid:374)to 7 (cid:373)ai(cid:374) plates, i(cid:374)(cid:272)ludi(cid:374)g: Antarctic plate, south american plate, african plate, eurasian plate, australian plate, pacific plate, north american plate. Tectonic plates are composed of the relatively rigid, brittle lithosphere. Plates "float" upon ductile asthenosphere plates interact at their boundaries, which are classified by relative plate motion: (cid:373)o(cid:448)e apart at di(cid:448)erge(cid:374)t (cid:271)ou(cid:374)daries, slide past o(cid:374)e a(cid:374)other at tra(cid:374)sfor(cid:373) (cid:271)ou(cid:374)daries, (cid:373)o(cid:448)e together at convergent boundaries. Type 2 = transdoem plate margine san andrea s.