Earth Sciences 2240F/G Chapter 3: EARTHSCI2240F - Chapter 3
7 Oct 2018
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If tectonic plates did not move that would mean that. If new crust is being produced in some pla(cid:272)es old (cid:272)(cid:396)ust (cid:373)ust (cid:271)e dest(cid:396)o(cid:455)ed i(cid:374) othe(cid:396)s. 6. 0 plate boundaries: b/c we are dealing with motion of segments on a sphere, we have 3 types of plate interaction. 7. 2 mantle plumes and hot spots: look at phenomenon that occurs in hawaii, hawaiian island sit in the middle of pacific and there is no plate boundary close to them. If the cold lithosphere is oceanic with a rough density of 3. 0g/cm3 basalt magma will attempt to rise upward. If the lithosphere is continental crust, with an average density of 2. 7g/cm3 basalt magma will still try to rise through it: either way magma beneath will tend to bulge up the lithosphere. 7. 3 do plumes produce spreading centers: given any degree of weakness, brittle crust will break in response to a never-ceasing stress from below (25) (26)
