ESS205H1 Lecture 3: Lecture 3
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Three types of rocks: igneous, sedimentary and metamorphic. Look at rock cycle on the second slide. Alfred wegener tried to describe continental drift in 1912. Heat rises, at low pressure rock melts, mantle plume leaks and forms volcanoes, the weight of. I(cid:374) the (cid:1005)96(cid:1004)"s, it (cid:449)as p(cid:396)o(cid:448)ed that plate te(cid:272)to(cid:374)i(cid:272)s e(cid:454)ist a(cid:374)d that the(cid:455)"(cid:396)e (cid:373)o(cid:448)i(cid:374)g. The(cid:396)e"s a patte(cid:396)(cid:374) fo(cid:396) ea(cid:396)th(cid:395)uakes a(cid:374)d (cid:448)ol(cid:272)a(cid:374)oes, the(cid:396)e"s (cid:374)o (cid:396)a(cid:374)do(cid:373) dist(cid:396)i(cid:271)utio(cid:374) the volcano bends the plate and it starts moving and new volcanoes form. Atlantic ocean started opening during the mid-jurassic. The average growth of opening of atlantic ocean is 3. 7cm/year. The crust and lithosphere is not the same thing: stage 1: east african rift, stage 2: red sea, stage 3: atlantic ocean. The (cid:396)ed sea is still ope(cid:374)i(cid:374)g a(cid:374)d it"s goi(cid:374)g to (cid:271)e(cid:272)o(cid:373)e atla(cid:374)ti(cid:272) o(cid:272)ea(cid:374) size. When one plate starts subducting into another, it creates massive earthquakes example: oceanic nazca plate subducting beneath south american.
