ATOC 184 Lecture Notes - Lecture 10: Mid-Ocean Ridge, Calcium Carbonate, Buoyancy
9 Jul 2018
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To see elements in universe you must log. Differentiated planet: sloshy shifting exterior, solid core, rocky mantle, rocky intermediate, crust. We can see the age of the ocean floor through ocean crust new crust at the middle of the oceans (mid ocean ridge) Floating depends on density: plates and crust float on mantle, 2 types of crust, continental, granitic, less dense, more buoyant, oceanic, basaltic, more buoyant. ~20 plates: constant movement but very slowly. Some plates spreading, some plates pushing, all at an uneven pace. Mid-ocean ridges (cid:862)bla(cid:272)k s(cid:373)okers(cid:863: water enters fractures then is heated by magma which dissolves minerals and cycles out of rock, minerals precipitate quickly and produce a rich ecosystem. Subducting plates had water minerals etc. rushing in. As the plate goes down it bends and breaks causing increasingly deep focused earthquakes. Volcanic chains in the center of plates: we do(cid:374)"t really k(cid:374)o(cid:449) (cid:449)hy these spots are hot, one example is the hawaiian islands.
