EESA06H3 Lecture Notes - Lecture 4: Intraplate Earthquake, Oceanic Crust, Danakil Depression
Document Summary
Two basic types of igneous rocks: can be identified by texture & chemical composition (how much silica: acidic rock a lot of silica in the magma. These magma that contain a lot of silica, erupts explosively very dangerous. Those rocks make up a big portion of continents. Granite: basic rock (cid:894)(cid:271)asalt(cid:895) (cid:373)ag(cid:373)as do(cid:374)"t ha(cid:448)e a lot of sili(cid:272)a, more fluid. Makes up oceanic crust, denser, sinks up back to mantle. More silica, lighter: rift basin: a crack in a continental plate which will widen and turn into ocean. Igneous dyke: passageways that magma was coming up from the underground to the surface: failed rift: a rift that never developed into an ocean. Pangea split and formed failed rifts. (toronto, nyc) Transform boundaries: where plates sliding past each other: terranes: little microcontinents collided with the west coast of. North america to become embedded in the continents.
