AS Geology - Earths structure 0.0 / 5 ? GeologyEarths structureASOCR Created by: SIM456cCreated on: 18-12-16 14:52 Oceanic crust 0-10km deep, made of dense mafic igneous rocks called bassalt and grows at around 17km^3 per year. 1 of 10 Continental Crust 0-75km deep, made of less dense felsic rocks and minerals such as quartz and feldspars. 2 of 10 Lithosphere 10-200km down which includes the crust and a section of the upper mantle 3 of 10 Asthenosphere A layer of mantle below the lithosphere with a rheid texture containing olivine and pyroxene minerals. 4 of 10 Rheid A rock with a plastic-like properties allows a small 'flow' due to partial melting. 5 of 10 Heights of the layers Crust - 35km (MOHO), Upper mantle - 700km, Lower mantle - 2900km (GUTENBURG) , Outer core - 5100km (LEHMANN), Centre of earth, 6371km 6 of 10 Shadow zones P waves - 7 of 10 Ophiolite suite An area of peridotite from within the mantle has risen up and has cooled on the surface 8 of 10 Paleomagnetism The study of the record of the Earth's magnetic field in rocks, (Sea floor spreading, polar wandering) e.g lodestone 9 of 10 Curie point The temperature at which minerals in the rock lose their permanent magnetic properties, to be replaced by induced magnetism. 10 of 10
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