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Download Earth`s Structure notes 5/26/15 • Crust
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Transcript
Earth’s Structure notes 5/26/15 • Crust- thin outermost layer – Continental crust is oldest, thickest, less dense and made of granite – Oceanic crust is younger, thinner, denser and made of basalt • Mantle- 80 % 0f the volume of the earth. – Upper mantle is rigid, below is the asthenosphere which is a plastic like layer on which the tectonic plates float. – There is a huge difference in temperature between the outer mantle and the inner mantle. – This difference in temperature sets up a convection current which is responsible for the cracking and moving of the tectonic plates. • Outer Core- liquid layer directly below the mantle (Fe, Ni) • Inner Core- solid innermost layer of earth( Fe, Ni) – Inner core is solid because the pressure is too great to allow it to be liquid • MOHO discontinuity - Boundary b\w mantle and crust Lithosphere • Made of the crust and upper layer of the mantle • Broken into 12 large pieces called Plates Magnetosphere – A region of the Earth’s upper atmosphere in which charged particles are trapped by the Earth’s magnetic field.