ENV100Y5 Lecture Notes - Lecture 8: Convection Cell, Eutrophication, San Andreas Fault
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ENV100Y5 Full Course Notes
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Mantle convection drives plate motion (heat transfer: hot rock (low density) rises from depth and cool rock (high density) sinks from the surface. Mantle is solid rock, yet it is able to convect. Three methods of heat transfer: conduction, convection, and radiation: hot, mobile mantle + thin, cool, brittle lithosphere. Mantle material heats by core, becomes hot, rises, gets to surface, cools down and becomes denser: not all material becomes dense when it cools. Dense material goes back down to get cooled again. Intraplate: (cid:862)(cid:373)iddle(cid:863) of the plate, geologically quiet with some exceptions. Plate boundaries: divergent (plates moving apart) Continental (ex: east african rift: convergent (plates moving together) Ocean-continent subduction zone (ex: anges: oceanic plate moving down to mantle, subduction occurs, (cid:862)a(cid:374)dies(cid:863) line of volcanoes running down south america. Do(cid:449)(cid:374)(cid:449)a(cid:396)d li(cid:373)(cid:271) of (cid:272)o(cid:374)(cid:448)e(cid:272)tio(cid:374) (cid:272)ell is (cid:862)su(cid:271)du(cid:272)tio(cid:374)(cid:863) Happens commonly in oceanic plate: transform (plates moving horizontally past) Estuary is where a river connects to the ocean.
