GEO 1111 Lecture Notes - Lecture 3: Heat Sink, Mafic, Fraunhofer Lines

• School: University of Ottawa
• Department: Geology
• Course: GEO 1111
• Professor: Donald Cummings

Document Summary

Was(cid:374)"t origi(cid:374)all(cid:455) a(cid:272)(cid:272)epted due to the (cid:271)elief of stati(cid:272) (cid:272)o(cid:374)ti(cid:374)e(cid:374)ts, ho(cid:449)e(cid:448)er it e(cid:454)plai(cid:374)ed so(cid:373)e thing. No valid mechanism (when wegener proposed it), thought that continents were plowing through crust. Plate tectonics (the unified theory of earth scientists) Fantastic data after ww2, from submarine sonars and magnetic signatures of the sea floor (barcode) Suggested that mid oceanic ridges were seafloor spreading ridges. Mid oceanic crust is always being sub ducted (why theres so little sediment) Explained missing sediment, why separated continents had similar floura and fauna (puzzle pieces), mid oceanic wedges, why ocean basins are there, creation of mountains. Trenches: depressions on the bottom of the ocean, created (cid:271)(cid:455) su(cid:271)du(cid:272)tio(cid:374) of earth"s (cid:373)a(cid:374)tle. If theres an infinite number of stars, creating light then the night sky should be very bright. 2 explanations: dark clouds fill voids or universe is finite. The early version of the big bang theory solves olbers paradox.